u/Nikslg

Hello, I am recently new cosplayer, or rather that's my new hobby.
I ordered few outfits from China (local is too expensive) using my measurements and received them. Usually everything is fine. New outfit that I received has correct arm lenght, but the moment I raise my arm I feel stiffness in my back. I feel like It's related to the way line goes near the armpit.

Is this a common issue? (I am not used to explaining measurements and issues I have in english, it's not my native language)