Plenty of firefighters have big egos, especially those of the male variety. But they aren't vain. You can't be. Here's why:
Clothes. The clothes are all men's. There's no vanity sizing here like there is in regular women's clothes. (Did you know that a size 6 in the 1970s would be labeled size 2 today?) Fire clothes come in XS to XX Large. They fit like you would expect men's clothes to fit. There was once a misguided attempt to create women's pants; these fit weirdly and were the worst "Mom Jeans" ever. The boots are men's boots. I wear a size 5.5 in them.
Hair. You will not have nice hair during fire season. If you do, it's not very busy and/or you aren't really an operational firefighter. You can attempt a nice French braid, but after hours and days of working outside, it will be dirty and full of split ends. Roots, if you have any, will appear. You may end up with an unintentional ombre look. You wear a helmet most of the time. Guys' hair will stick up in interesting ways that city guys pay a lot to replicate. Some give up and shave their heads.
Skin. No real firefighters wear makeup. It would be a mess. Sunscreen and insect repellant is about it. There's no room to tote your skin care routine in your bag. Your face is usually dirty anyway. I've gone for 3 weeks without taking a shower. These days you are more likely to have shower facilities on fires, but sometimes you're just too tired...and your clothes are dirty anyway.
Weight. Everybody knows it. Worse, the number they know is not your real weight: you know, the one you get first thing in the morning when you wake up. This is your FLIGHT weight. This includes about 10-15 pounds of clothes, boots, and flight helmet. It also often includes your fire pack, which weighs anywhere from 25-45 pounds. So there it is, a horrifying number next to your name on a manifest for everyone to see. You have to get over it. Lying isn't a good idea because a. there is usually a scale around, and b. You don't want to overload the helicopter because then it might crash. I regularly add weight on to the numbers people give me. At this point, I can pretty much tell what you weigh. If you come up to me and say your flight weight is 115 I will write down at least 130. Sorrynotsorry.
Who you are. You can't be mysterious or have too many secrets when you sleep inches away from other people, eat MREs together, and work next to each other for 16 hours a day. Let me just say: You go to the bathroom IN THE WOODS, people. Under these conditions your real personality will come out. Let's hope it's a pretty good one.
The good thing is, in the winter you can take out flatirons, mascara, and cute shoes if you want. You can go to a retirement party and be amused at how many guys come up to you, guys you know from the fireline who don't give you a second glance in the summer. You can think deep thoughts about how our society views beauty. Or you can just be relieved that for half the year, you have a lot less to worry about.