12b. Perform the following on both the back and front belt: Unfold the belt and now fold each lengthwise side in towards the center fold you had created.

• 将背后的腰带和前面的腰带同时完成以下操作。将腰带沿长轴中线对折，背面朝里。理平整。这是为了制作中央折痕。[建议熨斗烫出此折痕