From Butterick:
(A) Front-buttoned reversible shirt with short set-in sleeves, patch pockets. Trunks with back-elasticized waistband, top-stitch trim, notched legs. (B) Top-stitch trimmed pull-over shirt with set-in three-quarter sleeves, slashed neck, notched hem. Trunks same as View A.
Recommended Fabrics: Poplins, Duck, Sailcloths, Terry, Broadcloths, Gabardines, Twills.
Sizes: Small (34-36), Medium (38-40), Large (42-44)