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So, is there a way to un-sew your creation that you make?
From what I know, you cannot undo a sewing creation. When the sewing machine first came out (can't find the thread for it) there was a lot of warnings about not being able to undo a creation once it is done.
The closest to that you can do is before sewing an item; instead of "Sew," click on "Copy," which costs $$ (OMDollarz, not fee'z) and provides this option:
Sew the elements of your creation together to make it a unique outfit (keep the used elements).
The option to un-sew later, in case you change your mind, would be really nice.