People about cosplay...
No, it is perfectly normal to buy a cosplay costume. Even professional cosplayers buy or get the costume made from someone else. However, making your own costume has a different thrill to it.
What is important though, is how you carry the costume and how much fun you’re having while cosplaying.
As for “devaluing someone’s participation” goes, some may feel that your cosplay is superior to them, when they took more efforts. However, it is not supposed to be that way as these things are done for fun.
I think it is just fashion modeling in disguise. (pun intended)
Overall it is a harmless fun. As a creator (artist or writer) there is no greater honor than someone loving your show so much they would dress as your character and even try to be like them. Even against the possible ridicule.
Playing pretend can be fun. And it’s something everyone even families can engage.
But if you look at the most famous and successful cosplayers (as in Twitter famous) they are either:
A) People that could be modeling in mainstream modeling agencies.
This one is the category that gives more envy and disappointment to your average cosplayers. Of course they will get more attention even if your costume is more “comic/book” accurate or well done.
Like I said, cosplaying is basically fashion modeling. They look amazing and it’s nice to see models having a nerdy side.
B) People with awesome disguises that resemble the original show or movie.
In this category you’re judged by your amazing sewing skills.
So for being ultra famous you need to be one of those categories. But if not it’s just harmless fun you do with friends.
Think of it as early Halloween.
Sadly as a lawyer it isn’t professional for me to do this. But I respect people that do.
Costume play is very powerful tool. Any role play, with or without costume, allows a person to express things with much less risk and responsibility. Through this self exploration proceeds unimpeded, and new behaviors are tested to see if they will be useful.
Constructively used, this allows becoming more oneself and testing of one’s environment and abilities. I allows a person to test revealing things about themselves and see if it meets with rejection, and extend their comfort zones. It allows testing of fears, e.g., permitting a shy person to try being outgoing to see how well it works for them.
On the other hand, a costume, role or disguise also permits a person to enact their worst and most damaging behaviors anonymously. It is far easier to behave badly if one has a costume or role which hides the identity of the person both literally and figuratively.