Is it normal my girlfriend owns almost exclusively revealing clothes?

'Barely cover you' is a vague term, open to interpretation with no guidelines.

In times past, and currently depending where you are, a female showing any thing above the ankles and especially the knee is considered barely covered.
Think crew neck for neckline and sleeve length below elbow otherwise you're showing too much.

I happen to like short shorts, mini skirts(mid thigh), crop tops, and almost backless tops, I'm not much for plunging neckline, mainly because I don't have a lot of cleavage to make the tops look or fit right. Yes I chose those words on purpose, because it's about how the clothes fit or look on me, not about showing my breast.

There is also time and place consideration. Skimpier or more coverage may be appropriate. At a naturalist beach or location, a thong bikini may seem like a lot. In contrast going to the office or church with short shorts, super short mini, or even a deep plunging neckline may seem inappropriate.

That being said there are (imo) somethings that may be too short or show too much. I knew a guy who used to wear his shorts short enough or loose enough for things to hang out.
My rule of thumb is, if it's so short, plunging, or loose that you are constantly tugging, pulling, or adjusting it to prevent showing more than you want or should, then it's probably inappropriate.

Nothing bothers me more than to see another female constantly fidgeting, or a guy constantly grabbing/fixing his package.

Wear clothes that you're comfortable with. If you're constantly adjusting then you're wearing them to show off or at least for the wrong reason.

My wife loves teasing the guys by being the closest thing to nakedness and that also.

While there are individual differences from the general norms.... (i.e.; not everyone fits into generalizations)

Here is an ancient generalization that only a few have been able to improve upon (usually they just use different descriptions):

Men are from Mars
Woman are from Venus

They are different, and its a blessing when your partner appreciates the difference without being bothered by it.

Thank you.
:)

Not true for everyone, yes I enjoy my grungies around the house, however, I still look in the mirror before I really start my day. I still do my hair even if just in a pony tail. I still want to look presentable even to me.

Along with my grungies, a lot of times, still fit my desires of what I'm happy with or not. For example; I wear shorts or a long shirt my legs are seldom covered. That is if I'm wearing anything, I'm happy enough with myself and my body that I would rather be nude. If I'm at home, it's my house, my rules. Others, may choose tight or low cut because what makes them happy are their boobs, butt, or even something that's cropped so they can see their abdomen.

So even around the house with nobody else around, a lot of us do care but in a different way.

But that is her right. Anyway, since she's going out, she has to make an effort to look good so that people won't ridicule her. Also some places have strict dress codes.

That's a good thing