St. Peter's Basilica Has a Modesty Dress Code

St. Peter's Basilica in Rome, the Chief Church of Catholicism, establishes a dress code. Could America just adopt theirs?

Location:	Piazza San Pietro, Vatican City, Rome, Italy
Phone:	06-69881662 (for information on celebrations)
Hours:	Basilica (including the sacristy and treasury) Oct-Mar daily 9am-6pm; Apr-Sept daily 9am-7pm. Grottoes daily 8am-5pm. Dome Oct-Mar daily 8am-5pm; Apr-Sept 8am-6pm
Cost:	Basilica (including grottoes) is free. Stairs to the dome €4; elevator to the dome €5. Treasury 4 €.
Dress code:	No bare shoulders or knees (for both men and women).
Photography:	Permitted throughout (except in special necropolis tour)