I understand your problem completely David. Jocks are a problem for me this way as well. One would think that in stores like that, they would be more open to discussing package size.
Years ago I was at a store in New York that was very good that way. I was looking at swim trunks and underwear, and I did what someone else here has suggested by using my fist to give some idea of the accommodations. Of course, their products were displayed so yo can do that, and this store should do the same. When I was testing the pouch size a clerk asked if i needed help and if they were a good size for me. He suggested some styles for larger men etc. He was professional and to the point. Due to his help I did find something and he made a sale. I wish I could remember the name of the store; it was years ago.
Good luck.
Jack
Years ago I was at a store in New York that was very good that way. I was looking at swim trunks and underwear, and I did what someone else here has suggested by using my fist to give some idea of the accommodations. Of course, their products were displayed so yo can do that, and this store should do the same. When I was testing the pouch size a clerk asked if i needed help and if they were a good size for me. He suggested some styles for larger men etc. He was professional and to the point. Due to his help I did find something and he made a sale. I wish I could remember the name of the store; it was years ago.
Good luck.
Jack