Angelina
It seems there is a way to try a chastity belt,especially before buying one:My-Steel seems to have a showroom,for people who can visit them,making possible to try different sorts of chastity belts to decide which one they like the most,and they took the measurements.But it costs money(but,if they buy a chastity belt on this occasion,the chastity belt price is reduced by how much they paid),and there is only one of these showroom,in Germany(so less useful for people from other countries).
I don't know if other brands have such possibilities...