The Full Monty
(1997)

Due to the tremendous anticipation generated -and with the help of some "infamous" publicity, courtesy of their arrest at the steel mill-, Gaz (Robert Carlyle) and his friends get the courage and perform the strip number at the club, in front of a considerably large audience.  Gaz looks like he'll chicken out, but his son, Nathe (William Snape) compels him to do it.
 
And, yes, THEY DO THE FULL MONTY!!

 Thanks Dr Mat!