I've only tried that once. I embroidered a train but put it on upside down. Ended up putting butterfly over it. Looked OK, but was very stiff!!

I bought one of those shaver things that is suppose to cut the threads of bad embroidery, so you can take out you bad embroidery. Did not work for me. Guess I should ask my friends. Hugs and flowers.

I started a design on a black jersey hoodie and thread broke and hoop snapped off; I slowly picked out the threads but put holes in the fabric. Drat! But I picked out as much thread as I could, and then I put a mesh stabilizer in black on the front and stabilizer on the bottom and hooped it and stitched three flowers overlapping on the jacket. Turned out gorgeous but I did slown down the stitch speed and I did pick out as much of the old design as possible.

Maybe it is a possibility to embroider a design on a square of another fabric. And then applique it on to the sweater using one of the built-in stiches.

Always stitch on a sample first. Sometimes I just don't like the design and move on to another project.