From McCall's:
Three section dress, wrapped diagonally at front, may be sleeveless or have long set-in sleeves and may be underlined. Neck and front bands are interfaced and top stitched in place. Bands on sleeveless dress, with faced armholes, are of contrast fabric and dress may have contrast tie belt or self fabric patch pocket on right front. When pocket is used, bands are buttoned; on other views, dress is closed with snaps. Bands and tie belt for long sleeved dress may be self fabric or contrast.