60 cm of 140 cm wide fabric
55 cm of 140 cm wide lining(or 40 cm of lining if you choose the shirring elastic band method)
40 cm invisible zipper
For the shirred back piece : Method 1 : 150 cm of 5 cm wide shirring elastic band / Method 2 : 600 cm of 5 mm wide flat elastic band
* yardage can be optimized depending on bottoms pattern and size