Loose waves. Waves drop easily under their own weight. Long layers starting around the chin or collarbone add movement without making the ends look thin. A shoulder-length cut with face-framing pieces suits most wavy hair, and a softly layered bob can work well if the waves are strong enough to hold their bend at that length.
Springy curls. These suit rounded shapes. Long layers through the back and sides lift the crown and stop the triangle forming. Medium length is the easiest to live with, because there's enough weight to keep the curls defined and enough lift to keep them off your face. Curtain fringes cut dry can look good on defined curls, but ask for the fringe to be cut longer than you think, as it will shrink.
Tight curls and coils. These shrink the most and have the most volume, so the shape is built around the outline. Rounded cuts, tapered sides, or a long rounded shape all work. Avoid anything that relies on a sharp straight edge, because coils won't hold one.
Mixed patterns. Many people have looser waves underneath and tighter curls on top, or the reverse. A dry cut matters most here, because a wet cut treats the whole head as one texture.