Due to closet space limitations, I have twelve suits (including odd jacket+trousers combinations) that are OK (except for one quite particular Hugo Boss odd jacket that I only use on rare occsions) for my work. Six for spring/summer, six for autumn/winter. In that way, at an avarage, during each season I wear a suit about once a week. At an all year avarage, thus, once every two weeks. They seem to last forever: I buy two new suits every year, and give two away (due to said closed space limitations), and they do not look too worn out by then. On the other hand, they are no high end suits. Also, with the odd jackets, I have some extra trousers, that serve to increase the variety in available combinations and compensate for the extra wear that trousers suffer when compared to the jackets.