1- Do NOT select synthetic fabrics, only opt for cottons or linens.
2- Always layer up, as it gets cold in the aircraft, and not everyone provides you with blankets, never forget to carry your jacket/trench.
3- Don't forget your sunglasses and never wear belts, as they will hold you up at the security check.
4- You should wear comfy shoes/footwear, because you might have to walk a little to find your gate no. and wear socks if you get really cold in the aircraft, it helps you keep your feet warm and clean when you need to remove your shoes and sit comfortably.
5- Skinny/tight fit denims/trousers are a BIG NO. Wear only soft and airy/breathable pants so you will not curse the pilot for flying so slow.
Outfits you can opt for airports:
1- Co-ord sets (of course) they are the MOST comfortable piece of clothing, hassle free, looks great and trendy!
2- Shirt dresses : Very breathable and airy, looks great when layered up with a jacket/trench and a big tote bag that fits all your stuff.
3- Linen/Cotton pants and sando : The most classic and the best combo for airports is this, just don't forget to carry your jacket!