[Frank Miller]

The movies was Neighbors. a link to the website followed by the paragraph containing the quote.
http://www.busterkeaton.com/Synopses.../Neighbors.htm

Next, the family is seated around a table of wedding presents, including the essential How to Box by Jim Corbett. The male relations are armed with bats and bricks. The bride waits outside atop a trash can. J. Keaton has a broken arm, which he says was caused by Ford ownership. As Keaton dresses his suspender buttons pop off and he's left fighting to keep his oversized pants up. He joins the wedding party and he makes a speech about what he'll lose by giving up the single life. First gone are his trousers. The bride comes in, the minister breaks up a fight between Keaton and Roberts, and the ceremony begins. Keaton's pants drop, the minister's pants drop (Keaton stole his belt), then everybody sits down so that nobody's pants will drop. A guest gives Keaton a padlock, so he secures his trousers to his vest. Upon seeing the cheap ring that Keaton provided, Roberts calls off the festivities and drags his daughter home. Keaton tries to go after her, but his mother escorts him by the ear to his room.