Hey, at least it's white. I had a friend who had a black binder. Yeah, that didn't work out well.
If you can't find a thick enough tank top/vest/whatever, you could probably alter a thicker t shirt easily enough.
Largely unrelated, what anime/manga/game/whatever is he from? I've seen a few pictures of that character around the Internet and I have no idea who he is.
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Want to help create a US anime convention map?
COSPLAYS IN PROGRESS
Canterbury (Kuroshitsuji) - 30% - Kuro Gathering
Utatane Piko - default (Vocaloid) - 15% - Ohayocon
Boris (Alice in the Country of Hearts) - 3%
Armin/Jean/Levy (Shingeki no Kyojin) - 0%