taken out the sleeves and made them again? I have two zipper jacket sweat shirts that I love but the sleeves are to short since I am so tall. How easy would it be to take them out with a seam riper and make some myself? Or would it be better to just add some long cuffs?

I would have to find some knit or jersey to match the stripes in them also, lol.

I can't think of any reason that wouldn't work.

I've had to resew up hems on long sleeve shirts and on sweatshirts that had come apart. No different than if I had to redo something that I was working on kwim.

Yep, that sounds like something you could totally do! Good luck :)