Long-time lurker, first-time poster. Apologies if this has been asked before..
For suits, shoes, other items if it differs: does rotating through your wardrobe, "resting items", and spreading out wears add to the item's life in "number of wears", or does it simply spread out the wears you'll get over a longer duration.
Definitely the latter and maybe a little bit of the former. If I wear my suit 100 days in a row, it'll be in bad shape. If I wear it 100 times in a year, it will be in slightly less bad shape, but the main benefit is from the fact I wore a not yet worn out suit over a longer period.
Law of diminishing returns applies. No matter how well you look after a rotated suit, it will hit a use by wear date.
Shoes are a little different because they benefit from a rest. The moisture from your feet can make them wear more quickly. Or so they say.