9/30/21:
Gusset, Setup Rnd 1, final stitch count: 84 (98, 110) sts.
(This stitch count error doesn't affect any further instructions.)
11/4/21:
Gusset
Rnd 3 (C1): Sole—SSK, K to 2 sts before M, K2tog, SM; Instep—(K1, Sl1) 5 (6, 6) times, K1, work Wave Pattern, (K1, Sl1) to 1 st before M, K1. 2 sts dec.