again, the logic defeats me. people see your cool horizontal-striped shirt ... but does that mean you can't take your jacket off in case they see it's not striped all over ?
Well, according to notions of "proper attire" one wasn't supposed to take off the jacket in public in the first place - so no one would notice.
Then again the usual costumers of such shirts - workers and farmers - certainly were indifferent about such "rules of dress" - so no one would have really cared anyway.