I've been trying to not buy too many clothes lately, but I was out looking for cribs (for the home business) and did some browsing on the discount racks at Goodwill.  I found a shirt and pants I really liked, both half off for a total of $4.30.

Nothing too odd about the shirt.  It was a medium, normal size range for me.  The pants however were marked as 16/extra large...they didn't look extra large, so I think this is in kids or preteen sizes (do they have preteen sizes?).  That or they shrunk considerably in the wash.  I'm normally a size 9, but the pants looked like they would fit (and they were cute), so I tried them on.  Fit perfectly.

A LOT of clothes hit the clearance rack or thrift stores because they are mislabled or have a non-standard fit.  So don't be afraid to try something on just because it isn't "your size".  I have shirts that are large, small, or medium, and my pants range from size 7 to 11 (though I'll admit the 7s are a bit snug these days...must start exercising more).  Vintage clothes (particularly stuff over 20 years old) may have today's numbers, but don't fit the same way.  (I have a pair of "10" pants from the 70s that fit more like a "7" today).   Now throw a certain amount of realism into that...I've never found a size 0 or 3 that came close to fitting me.  A good test is to hold the waist band up to your stomach and see if it will reach around half of your waist.