ITSFWI

An abbreviation of "if the shoe fits, wear it," meaning that if something (typically negative) applies to one, one should acknowledge it or accept responsibility or blame for it. I know you don't like being called unreliable, but ITSFWI. A: "Why do teachers always treat me like some kind of troublemaker?" B: "ITSFWI."

Also, if the cap fits, wear it. If something applies to you, accept it, as in These problems are hard to solve, and most people would need help, so if the shoe fits, wear it! This expression originated as if the cap fits, which alluded to a fool's cap and dates from the early 1700s. Although this version has not died out entirely, shoe today is more common and probably gained currency through the Cinderella fairy tale, in which the prince sought her out by means of the slipper she lost at the ball.

If something applies to you, accept it. This expression is a version of an older term, if the cap fits, put it on, which originally meant a fool’s cap and dates from the early eighteenth century. This version is rarely heard today. Its replacement by a shoe probably came about owing to the increased popularity of the Cinderella story, and indeed, an early appearance in print, in Clyde Fitch’s play The Climbers (1901), states, “If the slipper fits.”