Flight suits are actually great. Anyone that hates on them can be safely ignored. It doesn’t make you a wannabe to appreciate garb designed for flying.
Edited to add: We sometimes fly long photo missions in wintertime conditions. I've become very partial to throwing a flight suit over everything else I'm wearing and find it both comfortable and useful, especially to have easily accessible pockets when you are wearing multiple layers and get a bit stiff mobility wise. If you fly older planes and want to keep your presentable clothes nice, it can also save you from dirt and grease, not to mention that there are benefits to Nomex if you ever have an accident. I by no means wear a flight suit on every flight, but when I was flying some with CAF, it was required, and it can grow on you.