For sewing stretchy fabrics my advice is to purchase an overlocker not a sewing machine, sewing machines will generally suck at stitching stretchy fabrics. If all you have is a sewing machine I recommend triple stitching if your machine has that as a setting.

I’m not a professional at this, I just repair my family’s clothes so if I’m wrong feel free to correct me.

They make vegan jelly (or jello) nowadays, don’t feel like you can’t have fun any more!