No shirt,No shoes,No service?what if someone goes in without Pants??

Well, no service then...because if you go out in public with no pants, a least in my state, you are guilty of public indecency. And given that most places would like someone other than you to shop there, they would probably call the cops on you. Plus....no pants=bad hygiene= issues with the health department. So, yeah...I think you'd be enjoying the city's hospitality pretty soon, while trying to post bail.

They will get serviced at the Police station, lol.