crosses are fine as long as they havent been worshiped actually since it is not an item that is worshiped these days you can even wear a cross on your shirt halachically if not protruding Just wondering why a halachic question is being asked on a forum why don’t you ask a rabbi ??is it bec you just want to hock but not serious about getting an answer lol
noitalmr a din is a din which means theres only chalos issur on leather. regardless of how comfortable other meterials are. But hey im sure god would appreciate it if you furthered you suffering and mourning over the bais hamikdash, may it be rebuilt speedily!