On my vintage 15-91 Singer I use this really really vintage Pfaff embroidery foot, it is awesome and would love to find another, its like gold to me! lol
I could not live without my binder since I love vintage aprons and need to be able to bind them, a bit tricky to master but once you do you will love it.
I like my edge stitcher for applying ric rac on vintage aprons I make.
I really love the ruffler too and could use it all day for no good reason! lol