u/Aggravating_Comb_636

I've just received my colombina sr cosplay but I'm missing a big piece of the other wing on her cloak. So I'm looking for the same fabric to make the missing piece myself since I feel like I won't get a replacement on time for the con. Does anyone have an idea as to what k8nd of fabric it is and where I could find it? 1st pic is what mine looks like and 2pic is what its supposed to be