I have heard people say online that many people can pick you out as a pilot just because of the LuggageWorks bag haha
On a 3-4 day drip, how many backups to your uniform do you bring?
To other flight crew sure, they can spot one another in plane clothes in a hotel bar, but to joe schmoe who can't read the huge signs with directions to the baggage claim or sitting there waiting for your deadhead and the flights delayed for some obvious reasons, think gigantic thunderstorm or blizzard and they ask you what's the deal. It comes in handy.
When I started I packed one extra by the end of my time at OO I just wore my only one. If you don't poop yourself regularly you should be fin.