If English is only one of your languages (I’m assuming everybody who’s reading this can understand English), then you might be interested in reading a t-shirt blog in other languages! (’Foreign languages’ is a very Anglo-centric term, if I were to use it, so I’m not going to!) I’ve found a few, so I’m just going to list the t-shirt blogs with a horrible Babelfish translation of ‘[language] t-shirt blog’.
Those are the four non-English t-shirt blogs that I know of; if you’ve seen others, let me know and I’ll add them to the chart! I remember seeing one partially in English, partially in Hindi (I think), but I don’t remember what it’s called… Oh, and if you can offer better translations, that would be cool too 
[I was inspired to compile this brief list after seeing Shirtspotting in Tcritic's blogroll]
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Well, my blog is in English, but I’m really portuguese (which probably shows in my English). Nice list, I didn’t know “Planeta T-shirts”.
Wow, just discovered that. Thanks for the mention. I’ll put you on my blogroll ASAP.