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I don't race and part of the reason for touring is mingling with the locals. You need party clothes to go to bars. Saving weight on street clothes is yet another interesting challenge. A buttoned shirt is 250g. Not much you can do about that. You could make a featherlight one from DCF but it would be the same as wearing a bin bag. Travel trousers are very light. Trainers can be 270g per pair. My cycling shoes are v light, so total shoe weight is as low as 1 pair of touring shoes. And I'd hate to wear the same shoes in the evening that I wore on the bike. The sweat and the stink...
This raises the most flags for me when you claim to be a weight weenie/ultralighter @nick_h.