Well....I couldn't hem something that I really wanted to, so the fabric was...splitting? or whatever and looked horrible. Luckily I was able to trim off the loose threads and it looks ok now.
Ummmm......oh! I brought a gorgeous long wig for my Yoko cosplay (Gurren Lagann) to Otakon last year, but we were unsuccessful in finding a way to keep it up in a ponytail (I'm not the best with wigs lol...so my friend who is told me it was impossible and there wasn't enough time or materials to cut the ponytail and turn it into a clip-on). Soooo I had to go and buy a wig at the con, which I'm absolutely in love with....at least I can use my old wig for Grell razz .
What else....oh! I was bringing in my sister's shorts for her Finnian (Kuroshitsuji aka Black Butler) cosplay and I did the one leg perfectly...but somehow the other leg ended up inside-out...well not the whole leg but just the part that I sewed together to take it in.
That's all I can think of...I'm sure I will have more horror stories before this Otakon arrives.