Inappropriateness not appropriate

I can’t decide if this corporate dictum I just received about “jeans day” is legitimately amusing:

Appropriate attire: The shorts should be business/tasteful and no more than 6 inches above the knee. Bermuda shorts, skorts, khaki’s, golf shorts, capri’s are allowed. Spaghetti straps, muscle shirts, tube tops, belly shirts or other inappropriate attire are not appropriate.