If you were to make a particular type of bra like structure, the best way to make sure that *ahem* lovely lady lumps will not poke through would be to use a foam padding or buy premade Bikini or bra pads which you can get at any local Jo-anns or fabric(For fashion) store.
You would be able to cut them to shape but be careful as many are not made to be cut up and will ravel and pull apart.
Creamy Mami- #Fightlikeamagicalgirl version
Yuri Kuma Arashi: Kureha Magical Girl Bear form
Formal Pearl: Steven Universe
Femme 1920's Riddler
1800's Inspired Ravenclaw
NoFlutter Artwork Jupiter Armor
NoFlutter Artwork Jupiter Bulesque
Harry Potter Regency looks