Custom Sweatshirt?

I would really love to work with a designer for a custom sweatshirt! There is an anime that is not very well known and the main character wears a sweatshirt for about five minutes on screen that is super simple, but even redbubble doesn’t have it for sale. I tried going through zazzleand websites similar to it, but the fonts are never correct. It’s just the characters name on a sky blue sweatshirt. Anyone know of a website I could be directed to? Thanks!