What follows is the first in what will be a series of questions I'll be asking in the hopes of solving a problem I'm running into with one of the species in my story: the werewolf, and the particular difficulties it has when it comes to keeping itself clothed.
In this story, werewolves, among other immortal humanoid supernatural creatures, live in secret amongst humans. The werewolves in this setting can transform into their werewolf form at will, as long as they are exposed to the rays of either the sun or the moon (any phase is fine; the reason they're associated with the full moon is that the fuller the moon gets, the more of the night the moon stays out for). For the purposes of these questions, all you need to know about this form is that it is 10 feet tall, and that shapeshifting does not do anything about the clothes the werewolf might be wearing at the time. Anything they are wearing will be rapidly pulled apart by the force of the werewolf's magically expanding body. Think the Incredible Hulk, except that there are no magic purple pants to keep them decent when they transform back.
Obviously if werewolves are going to blend in with human society, they're going to need to wear clothing. However, werewolves have a very important question to consider when deciding what to wear:
"If I transform while wearing this, will I still be able to put it back on later?"
While hanging around human civilization gives them some degree of protection from their enemies who similarly have to keep their existence a secret, they still may need to transform into their wolf form at a moment's notice, likely with no time to get changed first. Also, the obvious Doylist reason: I don't want every single werewolf action scene to be preceded by the werewolves taking all of their clothes off by hand. Dumb mental image, even if I try my hardest not to call attention to it. No, it'll be much better for everyone involved if these werewolves can wear clothing that, should they transform while wearing it, will merely come undone, rather than rip into pieces.
Also: If I've underestimated the elasticity of some fabric that could totally accommodate both a human and a 10-foot werebeast, they likely still wouldn't use that. If you happen to see a huge monster in the wilderness, well, that's one thing. It's bad news for secrecy, but it's not likely to be traced back to anyone in the pack unless you also see them transform back. But if that monster happened to be wearing clothes, well, not only would that make you immediately suspect human involvement in some way, but also you'll be extremely suspicious of those weirdos in that same sort of spandex that you just saw in town.
No, the way I see it, these werewolves need clothes that, upon transforming, will come apart into deliberate pieces that can be put back together later, and they need them to look as natural for the time and place as possible. They don't need to just buy something that already exists, they can tailor and modify pre-existing clothing to have new features, as long as it's realistically doable and affordable at the time and place.
Which brings us to part one of this question: what they're doing in the 21st century. Specifically, in the 2000s.
When werewolves have nearly all of modern clothing technology at their fingertips, what could they do to design clothes that could look like something a normal human would wear, but could be transformed out of without destroying it?