I’m sorry if this is more of an athletics question rather than fighting but how easy would it to fight in thigh highs? Either in boots or socks. I’ve sometimes seen it being a common design choice for female fighters (usually anime or video games), even in more realistic settings. I assume that it would be a bit constricting, especially on the knee and the part where it ends off on the thigh. But maybe Im overestimating how much of a hinderance it is?
It’s there because it looks attractive, not because it’s practical. So long as it doesn’t interfere with your mobility or balance it basically doesn’t matter. There’s two potential problems, is if it too stiff and impairs bending the knee and if it has high heels.
Elevated heels started with a practical use, it makes it easier to keep your boot in a stirrup and remain mounted during cavalry combat. The earliest use of high heels in women’s fashion were deliberately playing off of this.
Over the centuries, high heels have exaggerated, going higher and pushing the wearer off balance. They barely resemble the military riding boots that inspired the trend, and are completely unsuitable for combat now.
Heels affect the wearer’s posture by forcing the pelvis to tilt forward, forcing the wearer to compensate by bending the spine and accentuating their chest. It’s not a stable stance to fight from. You’ll frequently see characters in high heels, fighting, sprinting, and generally engaging in activities that are functionally impossible with their footwear. As you pointed out, this is very common in media where reality can be distorted without having to account for an actress undertaking the acts described. In addition to animation and video games, comics are another common source for this.
Much like cosmetics, high heels are designed to increase the sex appeal of the wearer. If you’re fighting to save the world, or even just your own life, this is probably low on your list of priorities.
The question about how much it constricts will come down to the individual article of clothing. While it wouldn’t surprise me to learn that the majority of women’s thigh highs heavily constrict movement, and are completely unsuitable for combat, you can reinforce a leather boot going up the leg, and allowing articulation at the knee. At that point, if the leather is thick enough to offer some protection, and the knee can move with minimal effort, it’s armor. Leather doesn’t make the best armor, but a layer of the stuff can protect against a lot of minor injuries. It’s also sturdy enough to use as a base for mounting heavier armor components.
However, we’re probably talking about a boot designed to make the wearer look good, rather than something that allows freedom of movement, and at that point it becomes a liability.
The only real potential use for a thigh high combat boot would be in situations where you wanted to armor the thigh, had a boot with a flexible knee joint, and it had a flat, or nearly flat heel. Ironically, riding boots are one of the rare moments where these would make some sense, as it would protect most of your leg from minor injuries, and if you did loose some mobility in the knee it would be less of an issue, since you’re not going to be running around on foot anyway. That said, you’re not going to get much more protection than you would with lower boots and heavy pants. So the value is limited.
Assuming the character is wearing shoes, their socks are not going to matter much. If they’re not wearing shoes, then socks can have serious issues with lack of traction, but that’s not what you’re talking about. Also, if they’re wearing heals that will still have a negative effect, but we already discussed that.
Since we haven’t mentioned this, a skirt isn’t a problem, so long as it’s lose enough not to interfere with movement, and isn’t long enough to get caught.
The real answer is thigh highs are used, mostly, for aesthetic reasons. While there are some potential uses, they’re vastly outweighed by sex appeal. You dress a character like this because you want them to be attractive, not because it’s practical combat gear.