Well, this was one of those things that as soon as it happened, I said, "Well, there's a blog post right there."
I went shopping on Tuesday and tried on some tankinis at Old Navy. Unfortunately, with me nursing and not ACTUALLY being a 14 y/o girl, the styles they had there made me look like a hoochie mama. So I ended up getting a really cute one that I didn't have time to try on at Target later (I went to go find a picture of it online, but dang, there are a lot of tankinis at Target dot com, so just trust me, it was cute).
Okay, so I got home, changed my pants, and lo and behold, I'm still wearing some black Old Navy bikini bottoms. Yes, I felt very stupid, and yes, I did return them. The guy (yes, I had to explain this to a male cashier) was very friendly about it, but secretly, I'm sure he was thinking I was a lunatic.