Did you ever use GAP Tall tops as maternity tops? I remember you had said you were going to try that back when you were pregnant. Was the only difference in fit the length?
I did get a couple. The biggest difference was in the length. I used them for layering and they worked great. My sister ended up with them after I did, they wash and wear pretty well! HTH!
I've never been pregnant, but thought you might like to know that Martin + Osa's tanks are really long and very stretchy. They've held up very well on me so far (I have some that are over a year old and the color hasn't faded at all.) They usually have a code floating around too.