Back in 1950, sports male underwear brand, Bike, became popular with the Jockstrap N. 10 model. There has been some throwback editions but due where I'm currently living at, it is not possible to get a pair, so I though sewing one. It is a simple pattern to sew, but I have a big problem finding the pouch fabric. Searching for some information about it, I found that is a knit fabric whose composition is made from 55% Nylon, 25% Rubber and 20% cotton. Out of this, I haven't been able to know how and where to find this fabric, or one the most similar possible. I hope you could help me with this. Thank you so much!