Compression stockings have nothing whatsoever to do with vasovagal syncope. This not to say that the use of such a stock is inappropriate. I suggest you have a long talk with the physician or a nurse to explain exactly what is wrong. Compression stockings should only be used under medical supervision and the tightness of the stocking is a medical issue. Whatever stocking is selected make sure that it is examined by a physician or nurse to insure it is the right one.
This isn't something that you should get information on from a forum!! I suggest calling his doctor and get a prescription for the correct compression stockings!!