I had a huge problem with a cosplay which was an Umbreon one (from Pokémon - ed.). I decided to have it made of satin, which was clearly a bad idea as satin is hell to work with. So I gave up on that cosplay and I don't intend on going back to it.
My favourite moment was when I was wearing my Hamtaro kigurumi* and a mother asked if she could take a photo of me with her son who was no older than 5. That really made my day because of how sweet it was.