What a beautiful machine! It will use any low shank attachment. Either go to
www.sew-classic.com or Ebay and look for low shank attachments. Don't be a sucker for low shank attachments listed specifically for the Featherweight with a jacked up price to go along with them. Short Shank is Short Shank. If you want to stick with vintage singer parts that is OK just don't pay for the Featherweight hype some sellers try to pull.
One attachment you might want to get is a vintage button holer. The featherweight uses the one in the green oblong square box not the green egg shaped box.