Paragraph 145. Where the hems on the corners of adjoining edges cross, the neatness of the work may be improved by cutting away some of the extra thicknesses. This may be done by squaring the corners so as to leave the ends of the hems square. To do this, after the hems are folded, crease the hems at one corner sharply as shown in No. 1, Figure 51, and with a pin mark the place on the under hem where the edge of the upper hem folds over it. Unfold the upper hem and cut out an oblong piece from the under hem about 1/4"