I tried on Ava a while ago, it looked good for straight jeans but in the end I went for TR Johnny and Billy instead. personally the stretch CoH fabric didn't feel quite right on straight/skinny jeans...

Ava fits tighter than Kelly's, so a 27 might fit snug at first. normally stretch CoH will give quite a bit after some wear.

about that auction, Vipfashions sells authentic stuff... those 27 Kelly's should stretch a bit too, but you can always tumble dry them.