I'm doing a gijinka Mewtwo cosplay for Anime North this year, but I've run into a bit of a problem. The tail turned out a fair bit heavier than I would have liked, but there's no way to make it lighter without completely ruining the shape. The material of the jacket is a lot thinner than I thought it would be when I bought it - bought it online, and the fabric looked thicker in the picture; go figure - so the tail is doing some serious pulling. I tried reinforcing the material with thick fleece patches, but that was a no-go, as you can see in the linked picture below.
(Yes, that is Madagascar 2 on my TV x3 I can't work without background noise, and I actually had never seen that movie before. Didn't end up getting to finish it, unfortunately.)
Clearly, what I'm doing isn't working. What I need is some sort of strong, unforgiving material that won't allow the tail to weigh the jacket down by that much, but I can't think of anything to try, and I'm hesitant to experiment too much, because I don't want to damage the jacket. It was kind of expensive, so ruining it is not in my best interests, as I absolutely cannot afford to replace it.
Any suggestions would be appreciated. I'm at a loss here, and I can't afford to let myself keep procrastinating, or before I know it, it'll be a week from the convention and I still won't have fixed this.