Or pictures? That's the best I can think of.

Oh that is actually a very good idea, unfortunately I don't always have the time to get my phone out and make a picture.

It is nice to keep things that remind us of past times, but instead of bras, why not things from events. Like ticket stubs to movies or concerts, or gifts they've given you.

sounds like you have a complex. Maybe it will go away by itself when you get older, I don't know... but watch out that it wont become a big problem someday. I bet you already had alot of trouble because of that.. well its understandable. No girls wants to feel like a trophy of someone who collects them, no matter if you can influence it or if its not your fault.. can be pretty dangerous if you mess around with the wrong girl