I'm looking for the best products to buy to avoid blisters (fabrics, creams or other)

Hello, there are lubricating sticks in specialized stores, if not in pharmacy you will find by the pharmacist the opsite bandage which makes like a 2nd skin.

You should also check the fit of the shoe and the type of stockings you use. The material can make a difference. A course store will certainly be able to help you in this regard. Otherwise opsite will help you a lot.