Pockets - everyone has heard of this one. Nonexistent or even fake pocket are the norm, and that is quite frankly ridiculous. Everybody needs places to put things sometimes, and pockets are just logical for day to day life.
Durability - go to the women’s section and check out some shirts. Many will be so transparent you can see your hand through them. What is this? Isn’t a shirt to cover your torso? Women’s t-shirts and jeans are half the thickness of men’s. Some of the jeans feel about as sturdy as a men’s t-shirt - and they only get worse once you wash or wear them a few times. Same goes with beading or spangles that will fall off, and screen printing and the like that will crack or peel sooner or later. It’s not designed to look good for long - keeps you going back to the stores!
Function - Men’s clothes, by and large, are functional. Nice big pockets you could throw a water bottle in, just about. Shirts with enough to tuck into your pants and prevent a draft. Inside pockets, for important items or when you want to feel like a spy. Warm hoodies. Jeans that don’t rip or slide down when you move about or squat. Coats that are warm and still cut along fashionable lines! Women’s clothing, by and large, is something that you need to accomodate. Shapewear to make the dress look nice. A camisole under your shirt because it’s translucent. Jeans that are more spandex than denim and are so tight to your legs that you can’t squat - necessitating a shift in your movements. Belt loops so tiny you’d be stuck with a tiny designer belt that would be useless in holding them up. Hoodies made of thin materials so as to not add too much bulk to your silhouette (as well as being cheaper to make) and needing several more layers to stay warm. It’s all for looks - you might look pretty standing there, but start doing anything and you’ll be acutely uncomfortable.
A variety of body shapes - most designers make one pattern along set lines, then size up or down as necessary. However, humans don’t grow in a perfectly mathematical function, so sizing far up and down from that ideal size starts to look wonky. The arms are too long. The shoulders too narrow. Weight distributed differently to bust and waist and hip, much less leg length, back dress length, and a range of other measurements that change through a person’s life and from person to person. Some folks are short- or long-waisted - and that’s okay! With clothing cut to fit more parameters than just a standard made-up size, we would have clothes that could fit more things. Women’s pants go by sizes - 4, 6, 8. Men’s have an inseam and a waist measurement. Short and stubby? No problem. Long and thin? Sure thing! Imagine if women’s pants were sold by two or even three measurements - it would be much easier to find ones that fit. Other clothing should be like this as well - how often have your sleeves been too long or too short? Perhaps the dress that fits in the waist is too narrow across the shoulders. People come in all different shapes, and clothes should too.