That's not the point.
NO-one is suggesting dress codes for the range.
What WAS expressed is the very legitimate concern about poorly-dressed (usually also exhibiting the same level of subject knowledge and public speaking skills) who show up at public hearings and rallies in cammies and similar wanna-be outfits.
Family night at the range? Come as you are, and welcome.
Public hearing on a proposed gun law? ON-camera interview with some reporter whose ignorance of firearms is exceeded only by his/her hatred for them? Dress up or shut up, if you truly wish to help preserve Second Amendment rights.
"Rambos" and similar militia morons are the Brady Bunch's best friends.