One pair that I classified as both "too small" and "have a hole between the legs" turned out to be the right size, and have only a small hole on the ass. With any luck I'll survive till my summer vacation.
(I usually buy my pants once a year, in the US. You can get really nice jeans there for $10 a pair. But in case of emergency I sometimes buy pants here. The last time was a bit more than a year ago, and they promptly fell off.)
I buy bras in the US, too. Although lately my size have been very hard to find, even though there are smaller and larger sizes all over the place. I am still looking for a way to blame Islam for that. Probably Osama Bin Laden is sitting on a pile of bras in Tora Bora.