Sorry that happened but I think we've all done that. Bet you'll be doubly careful from now on. Consider it a learning experience.
Guess what I did one time - I was making a tailored blazer with very expensive fabric (Christmas gift for mom) and was setting in one of the sleeves which can be hard to do without getting puckers, gathers or folds in the sleeve. Well, I did it perfectly and was so proud - until I realized I had sewn in the sleeve with the wrong side out. Thank goodness I had not yet trimmed the seam. I had to rip it out and start over. Fortunately, the first stitching didn't show and everything turned out OK. Let me tell you - I have NEVER done that again! Hard lesson learned!