It is telling my I need an XL with my bust size (they are gigantic right now), but I usually wear a large in tops. Should I go up a size or go with my regular size? I am wearing most of my regular tops still.
When I was at Motherhood this weekend the stuff I tried on was M and L.
Re: Do Gap and Old Navy sizes run large?
I thought so. I think their sizing charts are off. Even with my giganto boobs right now, I can't imagine wearing an XL.
We'll miss you sweet Debbie Girl (4.21.12) and sweet Cindy Girl (8.9.12)

They do run large, and the online sizing charts are crap. I'd buy your normal size. Case in point: I used the Gap Give and Get discount this weekend and bought 4 shirts off the rack (I had checked sizes online so I could get in and out of the mall). They're HUGE, like I'm swimming in them. They're going back tomorrow and I'll get my normal size.
Good luck!