^Stitches is from the same compay as UP, so it's not surprising! I ahve 2 jeans from Stitches and they have a STRONG smell... I don't think it smells like plastic though, but plastic doesn't really have a smell to me? I've washed them plenty, but the smell remains.
It sucks because the jeans I've bought from there before doesn't smell... it's the same brand though.