Well I don't see how any of your examples are equivalent of wearing something but a formal suit (as long as you don't have too much dirt on your shoes). I mean

Well I don't see how any of your examples are equivalent of wearing something but a formal suit (as long as you don't have too much dirt on your shoes). I mean if somebody like https://en.wikipedia.org/wiki/Lord_Buckethead https://en.wikipedia.org/wiki/Lord_Buckethead happened to be elected to parliament (as unlikely as it would be) I think he should have the right to wear his costume during sessions regardless of the opinion of other MPs because wearing that costume is a significant part of his political identity.