What makes an outfit practical or impractical to fight in? Would an acrobat’s outfit with some decent shoes be okay to fight in? Any suggestions on how to make an outfit frilly/girly without sacrificing (too much) practicality? (Trying to come up with practical[ish] Magical Girl outfits – know it’s not your genre probably – there are certain expectations for frilliness even for tomboyish characters)
You’re, basically, looking for three things: How well can you move in it, does it give potential foes anything to grab, and does it offer any protection?
If you can’t move freely in your clothes, you can’t fight in them. It doesn’t matter if we’re talking about them being tight enough to restrict movement, or if they make it difficult to walk around. Tight skirts, high heels, tailored suits; it doesn’t matter; they’ll all limit your ability to fight.
With footwear, you’re looking primarily at how well you can stand and move in it. Shoes and boots designed to grip the floor are (usually) the best options here. So, things like sneakers or work boots are good options. Rubberized soles will help you keep your footing far better when you’re standing in someone’s blood than a dress shoe or high heels.
Things like long coats, ties, free flowing skirts, scarves, hoodies, or of course capes, won’t usually limit your mobility, but they can give an opponent something to grab. Once that happens, that article of clothing will limit your mobility (some). This is also a factor that’s difficult to completely eliminate. Practiced martial artists can, and do, go for collar or lapel grabs on clothing you might think would pass. That said, there are some special cases here.
If the article of clothing will tear away freely, it’s (kind of) a wash. You’re still talking about losing clothes, which isn’t usually something you want, but it means you’re not getting dragged out of position by an attacker.
If the combatant is ready for it, it’s possible to use something like this as a firing point to retaliate. If you know, roughly, where their hand is, it’s much easier to extrapolate where the rest of them is in relation to you. This still doesn’t make fighting in long flowing garments a good idea.
The final factor, almost by definition, doesn’t really apply with magical girls as a genre, and can get a little weird when you’re talking about any superhuman characters.
Ideally, if you’re planning to get into a fight, you’ll want durable clothing that will take a few hits, and hopefully shield you from harm. Materials like leather and denim hold up much better than lighter fabrics. Insulation in a jacket will take some kinetic force from a strike (not a lot, but still), so it’s better than just jeans and a tee, or even a denim jacket. This also gets into a discussion we’ve had before. Protection is often about making tradeoffs.
An insulated leather jacket will (slightly) reduce your mobility. It will give an opponent something they can grab. But, it will also offer protection from stray hits and while parrying incoming strikes. It won’t protect against gunshots, or against a sword, and if that’s what your character was likely to face, they’d need armor to deal with those threats instead.
Somewhat obviously, exposed skin isn’t offered any protection. Technically, skin itself is protection for your body, and it does function as your first line of defense against infection, but that’s mostly academic in this context.
This is also where, magical girls, and most superhero subgenres, deliberately start straying from reality, without actually being unrealistic (in the literary sense). What matters is if your character has some kind of protection from the threats they’re facing. It doesn’t matter if that’s an ancient alien artifact, a mystical gemstone, or the weaponized power of friendship. That is what protects your character, not her denim vest. You’re also talking about characters where the threats they face are, effectively, impossible to mitigate through mundane means. Again, a leather jacket, no matter how snazzy, won’t do much against a death beam from some snarling murderbeast, or blows from a sword with an enchantment that drains the soul from anyone who touches it. As I’ve said before, you select your armor to deal with the threats you’re likely to face, and when it comes to magical girls, those threats are (almost always) going to be far beyond anything you could physically protect against.
Normally, you wouldn’t want to fight off an arisen god of war in a school girl uniform, but it’s not like a flak vest would offer any more protection against a threat like that.