I've seen a lot of "human version" My Little Pony fanart, and they always made me curious what the artists chose for clothing...
Anyway here's my own take on the Mane Six' fashion ^_^
Yellow off-shoulder sweater, knee length green skirt, barefoot (cutie mark on skirt)
White button-up shirt under purple sweater vest, black tie, gray plaid schoolgirl skirt, knee-high white socks, black mary janes (cutie mark on tie)
Brown cowgirl hat, orange tank-top, red collared tied-up shirt, brown leather belt, blue jeans, brown cowgirl boots (cutie mark on belt buckle)
Black sports bra under blue hang-off shirt, layered pink skirt, black knee leggings, pink converse (cutie mark on shirt)
Black/white strapless pencil dress, diamond necklace, skin-colored stockings, black high heels (cutie mark is necklace)
Blue hoodie jacket with rainbow sleeves, white workout shorts, blue sneakers (cutie mark tattoo on calf)