If it itches, scratch it

I spent several hours this weekend working on my 1975 era dress project. I tried it on before I put the sleeves on, and the fabric ITCHES! It felt fine in my hand, had a nice drape, so I never anticipate this problem. Guess that is why the fabric was on sale. I don't want to line it, so I guess I will rip out the zipper to use on something else and toss it. Grrrrrr. It am annoyed that I wasted so much time, but I will have to just consider this as practice, and move on to another project.

What do you do when a project isn't coming out right, for whatever reason? I HATE giving up on a project, and it is frustration like this that makes me question if I really want to start sewing again.