When you have a flat seat there will be too much fabric on your center back seam (CB). This causes the trousers to show too big on the thighs and the lower part of the bum. Remember that this specific trousers is designed with a lot of width. When having a full seat, the trousers have a tendency to crawl up and the reverse of this alteration is done.

NOTE! Only work with the back piece of the trouser. 


1. Crotch line on back piece has to be shorter/longer

  • Draw a smooth line from the crotch line down along the inside seam of the leg. The crotch line can be reduced/added with a maximum of 1,3 cm. 

2. The waist has to be lowered/raised

  • The waistline can be lowered/raised up to a maximum of 1,3 cm at center back (CB). The line has to end into zero on the side seam. Remove the parts that are no longer needed by cutting them away.

3. Draw a new facing for the back piece

  • Measure 5 cm from waistline and down at CB, both sides of the dart and side seam.
  • Draw a line in between the dart, it has to be slightly curved, like illustrated below.
  • Trace the two small facing pieces onto another piece of paper and tape them together at the dart lines. Now you have a new facing.