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Agreed that it doesn't sound like the trousers are necessarily the problem. Probably do a similar amount of commuting and always in casualwear and have probably gone through two or three pairs of trousers in twice that many years, and most of them were probably reasonably worn to begin with, or too tight to be sensibly cycling in..
@edavies94 when your trousers wear through is it a thinning of the fabric or a rip? My trousers that die generally do so ripping from being too stretched out by a wider range of movement than they were designed for, rather than worn down by friction/chafing..
I've have minimized the wear on my trousers by having the correct fit - trousers actually sitting at the waist and wearing fjällräven or haglöfs. I have three pairs that I rotate and have yet to wear through commuting 3500-4000km a year for two years.