I would love to do a cake like a gift box with a bra on top, could someone give me some pointers on how to achieve getting the bra to actually look like a bra? Is there a tutorial somewhere, I am wanting to make one for a friends birthday on Saturday. Thanks in advance for your help!

There probably is a tutorial somewhere but I can't find it.
To make the cups drape fondant &/or gp over a mini ball pan or any small bowl like thing. While those are drying, make a small flat bow. When ready to put together, just place the cups side by side w/the bow between them then cut 2 rectangles as the sides w/thin ribbons for straps. These should be done fresh so u can shape them as they are placed.

Yep. That's how I did it.