Store Demands Patrons to Pull Up Their Pants Before Coming In

We also know the classic 'No Shoes, No Shirt, No Service' - this is kind of like that. More and more, it's a fashion statement, or for comfort to sag your pants a bit but now that the trend is getting out of hand, this store is putting an end to it.

the sign reads:

Pull Your Pants Up
or Don't Come In!!!
Try to have some decency & respect for others.
No one wants to see your underwear.
*Does Not Apply To Children Under 3 Years of Age

Do you think this would be a good idea for some local shops to hang in their window?