>>10969939They're dynamic.
Here's what a nondynamic cloth looks like.
No life. No air going through it to look full.
For non-wire superhero cloth capes, it looks flat and doesn't have taht ruffled shape people associate with cape comics (those peaks on the edges, that eventually became part of the cape design).
Most toylines when they use wired cloth look like they're using blankets and towels, and usually an unfinished looking underside. No natural looking folds either, unlike plastic capes that are sculpted to look natural.