ok so i used to work for this sportswear manufacturer
tripleplay and they sourced their shorts from a few places... the only one i could remember was
Johnny Bobbin but it seems they dont have the shorts on their site...
auspirit has some ladies boardshorts that are similar... but not really
i'm sure there'd have to be similar companies in the us bringing in this kind of stuff
or if you want to buy enough you could get some from india or
china...