What should I use to sculpt my body to be more feminine?

Hi all! Newbie here but doing my best to gather what knowledge I can.

I'd like to cosplay a character (Rogue, X-Men) however I have a rather large and boxy frame, with little "feminine assets". For the sake of staying closer to the character, I was curious what I could do to accentuate said features temporarily, while still looking natural. I don't mind doing a little crafting if necessary.

Any ideas?