Chisel - you are right that artists shouldn't be expected to dress like average folks, but I should also add that we also shouldn't be expected to dress like crazies, either. I hate it when people act all surprised when I tell them I'm an artist, just because my looks don't fit the stereotype. I just like to cruise under the radar.
However, I rock a man's tie now and then when I dress up in a suit, but that's because I can't find any ladies' ties anywhere.
And the Scottish "purse" you're referring to is called a sporran.