How many outfit formulas do you actually need?
Five to seven - enough for a week without repetition, few enough to remember without notes.
The point of a formula is that you do not have to think, and a list of twenty makes you think. Most people settle into five to seven that match their actual life: two for work, two casual, one for going out, one for weather extremes, one wildcard. Audit yours quarterly the same way you audit a closet: any formula you have not used in a season is costing you memory, not saving you time. Retire it and double down on the ones you reach for.