Hmmmm.... I would think that if one worked at the Craft, the wear and tear on his apron would be apparent. To me, my pristine apron would say that I had not labored but had been a bystander when work should have been actively pursued.
But, when it really boils down to the bare facts, isn't the apron a part of the external?
Just my 2 bits worth. I would wear mine but, as a recently raised Master Mason, I'm not sure how it would be received. Still debating with myself over that.
-Daniel