/cgl/ - Cosplay & EGL

What do you guys look for in terms of tops? I know they tend to be covered with neckties/carsigans/blazers but I still find myself being really picky when I'm buying them. I have one cheap cotton walmart short sleeve white button up, and I managed to find a silky 3/4 sleeve white button up at the thrift store that I love. (Pic related).
Do you think certain material, sleeve lengths, cuts, etc are more suited than others? And of course there's the question of color and what you can get away with. I tend to stick to white but I do have a tan/cream blouse that pairs well with red skirts and brown shoes.