I had a job once where ties were mandatory, back in the distant past. I was theoretically a "database administrator", but all they had me doing was just data-entry work, since I was the low man on the totem pole (no seniority and next-to-no experience).
After I'd been there about a month, I was in a hurry one morning and forgot my tie. Nobody seemed to notice. About a week later, I "forgot" it again. Then a couple more times in the next week or two. Then I just quit wearing it entirely. I eventually got one or two comments about it from the other techs, more in the spirit of friendly ribbing than anything else, but, aside from that, nobody ever commented on it or showed any sign of disapproval at my noncompliance.