You signed up for your first half-marathon. 13.1 miles. Somewhere between the excitement and the "what did I just do," a very practical question shows up: what do I actually wear?
Here's the good news - getting dressed for race day isn't complicated once you understand the one rule that governs all of it. And getting it right is the difference between floating through the finish line and spending 13 miles fighting a waistband, a blister, or a soaked, freezing layer you wish you'd left at home.
This guide walks you through exactly what to wear, in order, from the skin out. Save it, bookmark it, and grab the packing checklists at the bottom so nothing gets left behind on race morning.
The One Rule: Nothing New on Race Day
Before we talk about a single item, memorize this: nothing new on race day.
Every piece you wear should already have logged miles in training. New gear is where blisters, chafing, and "I had no idea this seam would do that" surprises come from. Your race outfit should be your most trusted, most boring, already-broken-in kit. Test everything on a long run first.
With that locked in, let's build the outfit from the ground up.
Step 1: Start With the Right Sports Bra
This is the foundation, so it comes first. For 13.1 miles you want a bra that offers support with zero distraction - no digging straps, no chafing seams, no riding up. Look for sweat-wicking fabric, a band that stays put without pinching, and a fit you've already tested on a long run. The goal is to genuinely forget it's there.
Step 2: Choose Your Bottoms (Shorts vs. Tights vs. Capris)
Your bottoms come down to weather and personal preference, and all three work - the key is anti-chafe fabric and a waistband that stays put.
Reach for running shorts when it's warm; choose ones with a comfortable, non-roll waistband and a liner or fit you trust. Built-in pockets are a huge bonus for gels and a phone.
Go with capris or 7/8 tights in mild or breezy conditions - they're a favorite because they prevent inner-thigh chafing entirely and stay exactly where you put them.
Save full-length tights for genuinely cold race mornings. Whatever you pick, make sure you can hold your fuel without your bottoms sliding down once you start sweating.
Step 3: Pick a Breathable Top
Choose a lightweight, sweat-wicking top - a tank or short-sleeve in warm weather, a long-sleeve in the cold. The non-negotiable is fabric that moves moisture away from your skin.
Avoid cotton entirely: it soaks up sweat, gets heavy, and is a leading cause of chafing. Make sure the cut doesn't rub on the underarms or shoulders over long miles.
Step 4: Get Your Socks Right (Don't Skip This)
Socks are tiny and people overlook them, but they are your single best defense against race-ruining blisters. Choose technical running socks made of synthetic or wool blends - never cotton. Look for a snug, seamless fit and a little cushioning where you need it. Whatever pair you choose should already have a few long runs on them, so you know they don't rub.
Step 5: Run in Your Broken-In Shoes
Your shoes should have somewhere between roughly 30 and 300 miles on them - broken in, but not worn out. Race day is absolutely not the time for a fresh pair out of the box. If you know you'll need new shoes for the race, buy them several weeks early and train in them so they're ready.
Step 6: Layer for the Start Line
(and Ditch Smart)
Here's the trick most first-timers don't know: dress for about 10–15°F (5–8°C) warmer than the actual temperature, because you heat up fast once you're moving. You'll feel slightly cold standing at the start - that's correct. If you're cozy before the gun goes off, you'll be overheating by mile 3.
For chilly starts, wear a throwaway layer - an old long-sleeve, a cheap pair of gloves, or even a trash bag with armholes - that you can toss once you warm up. Many races collect discarded clothing for donation, so check your race info. The smart move is to be a little cold at the start and comfortable for the other 12 miles.
Step 7: Don't Forget the Small Stuff
(the Details That Save You)
These little things make a disproportionate difference.
Anti-chafe balm applied anywhere skin meets skin or fabric — inner thighs, underarms, sports-bra band, even feet — can save your race.
A hat or visor and sunglasses handle sun and keep sweat out of your eyes.
A running vest carries your gels, phone, and keys without bouncing.
And in cold weather, lightweight gloves and a headband or ear cover matter more than you'd think, because your hands and ears get cold first.
Quick Reference:
How to Dress by Temperature
For cold weather (under ~40°F / 4°C), layer up: long-sleeve base, light jacket or vest, full tights, gloves, and an ear cover.
For cool conditions (~40–55°F / 4–13°C), a long-sleeve or tank with arm sleeves plus capris or tights works well, with a throwaway top for the start.
In mild weather (~55–65°F / 13–18°C), go with a short-sleeve or tank and capris or shorts.
And when it's warm (65°F+ / 18°C+), keep it minimal: a tank or singlet, shorts, a visor, and sunglasses.
The Night Before: Lay It All Out
Set everything out the night before in the order you'll put it on - this is the classic "flat runner" layout (your outfit laid flat as if a person is wearing it). Pin your race bib to your shirt, clip your timing chip to your shoes if needed, and double-check your fuel is in your pockets or belt. Race morning is for coffee and nerves, not hunting for a missing sock.
And that's it - you're dressed, you're ready, and you've removed every wardrobe variable so you can focus on the only thing that matters: enjoying your first 13.1.
Final Word: What to Wear for a Half Marathon
Now you know exactly what to wear for a half marathon, from your sports bra all the way down to your socks and shoes. Figuring out what to wear for a half marathon really comes down to one habit: test every layer on a long run first, dress for the weather, and never try anything new on race day. Keep this guide handy, because deciding what to wear for a half marathon gets easier every single time you do it.
Ready to build your race-day kit? Explore our running sports bras, find your perfect pair of running shorts, or browse all EMIÉ activewear to put together an outfit you can trust for 13.1 miles.