you can do it with the sexy bad girl outfit but you can leave the lower grade wild hair-however youll get an A. But its worth passing for the items from the following levels until you can gather enough hairs to upgrade

I guess naming the items is too complicated

At the top left when you click on 4-3 there is a pink diamond shaped box called momos tips. Press on it, then press S TIPS.
they suggest: vintage england hair, flower moon cloak, ring bikini top, ring bikini bottom, victoria's secret socks, exquisite slippers, leather purse, cross bracelet, lotus leaf tassel, floral ink gloves and lastly peach sweetheart makeup)
I got s without his suggestions cause i dont own the bathing suit in question:
so i used
hair:bird song
coat: flower moon cloak
top:pink storm top
bottom: pink storm bottom
socks designer's life
sandals polka sandals blue
makeup: peach sweetheart
necklace Oceanic pearl rare
bracelet lotus leaf tassel and cross bracelet
gloves floral ink

When doing the princesses, ive found the exact same suit used for maiden, as suggested by momo for S, will work for an s also.