Use woven fabrics such as cotton, lawn or linen. Use viscose/rayon or satin for a softer, drapey look.
5-7, 1/2”[1.3cm] buttons. 5 if you are making the short sleeved version, 7 if you are making the long sleeved version. Matching thread .7 yards [.6 meters] Light to mid weight-interfacing (see yardage)