How to dress for work in hot weather.

Most advice about dressing for work in hot weather is useless. “Wear lighter colors” and “choose breathable fabrics” — technically correct, but it doesn’t tell you which specific shirt won’t show sweat stains by 10 AM or which pants won’t stick to your legs during a commute. I tested 12 different combinations through a 95-degree July in a business-casual office. Here’s what actually works, what’s a waste of money, and the one fabric you should probably avoid entirely.

Rule #1: Ditch Cotton. The Three Fabrics That Actually Wick and Breathe

Cotton absorbs moisture and holds it against your skin. That’s why your shirt feels heavy and damp by lunch. You need fabrics that pull sweat away and dry fast — or ones that let air move through freely.

Linen is the obvious answer, but it wrinkles in ways that look unprofessional in most offices. Merino wool (yes, for summer) regulates temperature better than any synthetic, but a 100% merino dress shirt costs $80–$130 and requires delicate washing. Technical blends — polyester-nylon-spandex mixes with moisture-wicking treatments — are the practical workhorse. They dry in minutes, stretch, and resist wrinkles.

Three brands I’ve worn through full workdays:

• Uniqlo AIRism undershirt ($15) — not a standalone shirt, but worn under a lightweight button-down it eliminates visible sweat marks. The mesh version breathes best.
• Mizzen+Main The Lee performance button-down ($98) — 92% polyester, 8% spandex. Machine wash, hang dry, zero ironing. I wore it through a 100-degree day and it looked crisp at 6 PM.
• Wool& Prince merino button-down ($128) — 100% 17.5-micron merino. Wore it four days straight on a work trip with no washing. No smell, no wrinkles. Expensive, but if you travel light it pays for itself.

Bottom line: If your office allows untucked or smart-casual, the Mizzen+Main is the best value. If you need a tucked-in dress shirt that stays crisp, go Wool& Prince. Skip cotton dress shirts entirely from June through August.

Rule #2: The Right Pants Make or Break Your Day

Your legs generate a lot of heat. Thick chinos or dark denim trap it. The goal is a pant that looks like a trouser but breathes like athletic wear.

Lululemon Commission Pant ($128) — Warpstreme fabric (nylon, polyester, elastane). Stretches, wicks, and dries fast. I’ve worn these in 90-degree heat and they never felt clammy. The slim fit works with dress shoes or clean sneakers. Only downside: the fabric has a slight sheen that some offices might flag as too casual.

Ministry of Supply Apollo 5-Pocket ($135) — Knit fabric with a woven appearance. Looks like cotton chinos but weighs half as much. The gusseted crotch means no pulling when you sit. I’ve worn these on 12-hour days without needing to change.

Bonobos Summer Weight Stretch Chino ($98) — 98% cotton, 2% elastane, but cut from a lighter 6-ounce fabric instead of the usual 8–10 ounces. Not as breathable as the synthetics above, but acceptable if you prefer natural fibers. Hand-wash cold; the cotton shrinks in the dryer.

What about shorts? If your office allows them, the Outlier New Way Short ($125) in 68% nylon, 32% cotton looks like tailored chino shorts and dries in under an hour. But most offices above startup-casual level don’t allow shorts. These pants above are the realistic alternative.

Rule #3: Sweat Management — The Undershirt Strategy That Actually Works

This is the single cheapest upgrade you can make. A good undershirt creates a moisture barrier between your skin and your dress shirt. Sweat soaks into the undershirt, not the outer layer. , the dress shirt stays dry and odor-free.

The Uniqlo AIRism Mesh Crew Neck ($15) is the best I’ve tested. The hexagonal mesh pattern maximizes airflow. The fabric has a cooling feel when you first put it on. It’s thin enough that you can wear it under a white shirt without showing through — as long as you choose the nude or gray color. White undershirts under white dress shirts still show at the collar.

Alternative: Thompson Tee ($34) — has built-in sweat shields under the arms. If you sweat heavily, this is the better option. The shields are sewn into the armpit area and absorb up to 8x their weight in moisture. Downside: the extra fabric makes it warmer overall, so it’s a tradeoff.

Failure mode to avoid: Don’t wear a cotton undershirt. It defeats the purpose. Cotton absorbs sweat and holds it against your skin, making you feel wetter than if you wore no undershirt at all.

Rule #4: Blazers and Jackets — When You Have to Wear One

Some offices require a jacket year-round. If you’re in that situation, you need a specific kind of blazer: unstructured, unlined, and made from a breathable fabric. Most off-the-rack blazers have a full lining of polyester or acetate — that’s a plastic bag wrapped around your torso.

The Suitsupply Havana ($499) is the gold standard for summer. It’s half-lined (only the shoulders and back panel), made from 100% wool as light as 9 ounces per yard. Wool breathes better than cotton or linen in a jacket because it regulates temperature actively. The unstructured shoulders mean no padding trapping heat.

If $499 is too steep: Spier & Mackay makes an unlined linen-cotton blend sport coat ($298) that’s 55% linen, 45% cotton. Full canvas construction at half the price of comparable brands. The fabric wrinkles, but that’s part of the look.

What not to buy: Any blazer with a full polyester lining, regardless of outer fabric. The lining creates a greenhouse effect. Check the care tag before buying — if it says “100% polyester lining” or “acetate lining,” put it back.

If you can skip the jacket entirely, do. But if you can’t, the Havana or Spier & Mackay options are the only ones I’d wear through a heat wave.

Rule #5: Shoes and Socks — The Most Overlooked Heat Source

Your feet sweat more per square inch than any other body part. Trapping that sweat in leather dress shoes with cotton socks creates blisters, odor, and general misery. The fix is specific and cheap.

Socks: Darn Tough Vertex Quarter Cushion ($22) — 54% nylon, 43% merino wool, 3% elastane. Merino wicks moisture and resists odor. I’ve worn these for three days straight on a business trip with zero smell. They’re thin enough to fit in dress shoes. The lifetime guarantee means you pay once and replace for free if they wear out.

Alternative: Uniqlo Socks ($10 for 3 pairs) — 80% cotton, 18% polyester, 2% spandex. Not as breathable as merino, but the low-cut no-show style works with loafers. Wash them inside out; the elastic degrades after about 6 months.

Shoes: Avoid thick leather oxfords with rubber soles. Look for unlined leather loafers or derbies with leather soles or thin rubber soles that let the foot breathe. The Meermin Unlined Loafers ($175) are unlined calfskin on a leather sole. They mold to your foot and let air circulate. The Cole Haan Zerogrand ($150) has a knit upper that’s essentially a sneaker disguised as a dress shoe — not appropriate for formal offices, but fine for business casual.

One rule: Never wear cotton socks with dress shoes in summer. The combination of sweat + cotton = blisters within 2 hours.

Rule #6: The Color and Fit Cheat Codes

Lighter colors reflect sunlight, but the difference between light blue and navy is smaller than most people think. The real heat management comes from fit. A shirt that’s too tight traps air against your skin and prevents airflow. A shirt that’s too loose billows and lets air circulate, but looks sloppy.

Specific fit guidelines:

• Dress shirts: Collar should fit one finger comfortably when buttoned. Sleeves should hit your wrist bone. Torso should have 2–3 inches of extra fabric when tucked — enough to blouse slightly, not enough to look baggy.
• Trousers: Flat front, not pleated. Pleats add fabric that traps heat. The leg opening should be straight — skinny pants restrict airflow, wide pants look unprofessional in most offices.
• Undershirt: Should fit snugly against the skin. Loose undershirts bunch up under dress shirts and create visible lumps.

Color strategy: Light gray, light blue, and white reflect the most heat. Pastels work if your office allows them. Dark colors absorb heat but can still be worn if the fabric is breathable — a dark navy linen shirt breathes better than a white cotton shirt. The fabric matters more than the color.

Rule #7: When to Break the Rules — And What to Skip Entirely

Not every situation calls for the same approach. Here are the exceptions and the things I’ve learned to avoid.

When to ignore breathable fabrics: If your office runs the AC at 68 degrees year-round, breathability matters less than layering. Wear a cotton shirt under a merino sweater and remove the sweater when you go outside. The Uniqlo AIRism undershirt still helps, but the outer layer can be anything that fits.

When to skip the undershirt entirely: If you wear a performance dress shirt (Mizzen+Main or similar), an undershirt adds unnecessary heat. The shirt itself wicks moisture. Undershirts are for cotton dress shirts only.

What to never buy:

• Any dress shirt labeled “wrinkle-free” that’s 100% cotton. The chemical treatment reduces breathability.
• Polyester ties. They trap heat at your neck. Silk ties breathe better, or skip the tie altogether if your dress code allows.
• Leather dress shoes with a full rubber sole and no perforations. Your feet will sweat through your socks by noon.

Final recommendation: Start with one upgrade — the undershirt. A $15 Uniqlo AIRism mesh crew neck under your existing cotton dress shirts will reduce visible sweat and keep you cooler than any single clothing purchase. From there, replace your pants with Lululemon Commissions and your shirts with Mizzen+Main. That three-item wardrobe swap costs about $350 total and works for 90% of business-casual offices through any heat wave.