Having found the 32B too tight, I thought surely its sister size would be more comfortable. My face actually sank when I put this on. It was perfect in the cups but the band rode up in the back. To the giveaway bin it went.
Of the three sizes I tried in this style (32B, 34A, and 34B -- I'm still getting my feet wet!), this was the best fit. Like the Katie, it's a little roomy up top since my breasts are more shallow but adjusting the straps helps to even it out. It's a very similar cut, only softer with more coverage, which is why I was so hard-set on finding the right size. Because I wear a 32B in Katie, however, I was confused as to why all my other Aerie bras felt so ridiculously tight. Now that I've figured THAT out, I have a new go-to T-shirt bra.
If the cups were any closer together or the band any tighter, this would've been returned. But because of the stretch (not too much, just enough to conform to your body) it works out. I can't usually fill out full coverage bras but this one's nice with no wrinkling or buckling. The material is extra soft and the contrasting straps are cute.
ETA 4/5/2014: After wearing it for half the day, the wires in the front had become painful and I had to take it off. I think this confirms I should start sizing up where Aerie is concerned.