I have two pairs of leather booties (Clarks, Kenneth Cole), with about 1" flat heel. They fit well, not too loose, definitely not tight. Whenever I wear them with ankle or knee-high socks, they start "eating" the sock down... as I walk, the back of the sock starts sliding down towards my heel and bunching up under my foot. Has anybody had this happen? Is it the socks weight/finish (cotton mostly), the inside material of the bootie?... tips other than adding an insole? Thanks!