A fictional store where women can purchase age-inappropriate clothing.
Usually cited when a woman of advancing age (a) wears clothing better suited to a female half her age or (b) wears club clothes to work.
Person A: Lawd, did you see that dress Propecia was wearing today?
Person B: Yea, was there a sale at Forever 31 I didn't know about??
Person A: Yup, looks like that dress is from FXXXI's "Club to Conference Room" collection, late 2009 if I recall correctly.