Uhm, depends what you like and what you want it for.

So, if you want to find out what kind of clothes work for you, then you should look for dirt cheap ones just so you can see what you like. For example, short skirt, ankle length skirt, dress, blouse, shorts crop top, etc. this way you can figure out what looks good on your body and what you like without dumping a lot of money.

If you actually want to wear things out, then you can stay pretty androgynous. You can grab some blouses that basically look like button downs or tunics, and guys don't know the difference. Even basic long sleeve girl tops are cut a bit differently and are more stylish, and most people won't clock that it's for women. As far as bottoms go, you can get really loose fitting cotton/linen pants especially in the summer. These are great because they are so loose and flowy that when you stand still, they basically look like a skirt.

Accessories you can buy what my wife calls costume jewelry. Really cheap shit that looks good to me. Rings, bracelets, clip on earrings, brooches, stuff like that. You can really dial how femme you wanna be depending on how many accessories you want to throw on.

While it's not clothing, nail polish can really bring an outfit together. It's also becoming more common for guys to have their nails painted which may make you feel less pressure.

It's not exciting or anything, but if you're building a wardrobe, it's good to have neutral/flat color basic tops to wear because you'll be able to pair them with anything you want to wear over it.

Also, don't get discouraged if you don't immediately like the way you look. Consider this a new skill you're learning. It takes time to figure out your aesthetic.

Wow, when I started writing, I didn't know I was going to say this much. Good luck!