What a lovely suit! It is made of black and white Glenurquhart plaid. The jacket is lightly fitted and single breasted, and has 3/4 length sleeves. It also has a fitted vest and a slightly pleated skirt.

Glen plaid (short for Glen Urquhart plaid) or Glenurquhart check is a woollen fabric with a woven twill design of small and large checks. It is usually made of black/grey and white, or with more muted colours, particularly with two dark and two light stripes alternate with four dark and four light stripes which creates a crossing pattern of irregular checks. Glen plaid as a woven pattern may be extended to cotton shirting and other non-woollen fabrics.

Photos courtesy of The Museum of the City of New York.