Here's a tutorial on how to sew a two-piece sleeve vent on a lined tailored jacket like this:
Now make some fusing patterns just like the shaded areas on the diagrams:
- 2cm above your sleeve hem
- 2cm in from each sleeve seamline
- 3mm in from each cut edge of sleeve patterns
Cut out your fusing patterns, then cut and apply your fusing to your sleeve panels.
Can you spot my mistake?
Now you can start sewing, but guess what - if you've followed the preparation above, there are only three lines to sew in your sleeve vent! Easy-peasy - here goes:
Now sew your undersleeve corner - just fold your hem up along the hem fold line, bag out at 1cm and turn corner through:
Overall you should have something that looks just like this:
- the hindseam is pressed open
- the undersleeve vent edge is pressed back 1cm (3/8")
- the top sleeve vent fold line aligns with the undersleeve notch (highlighted here)
- the topsleeve and undersleeve hemlines align - not like this example below!