Tips for setting in sleeves:
- use a longer gathering thread than the pattern suggests. I tend to see a line (with released tension) from the start of the up curve on the sleeve head - pretty much from the arm pit up.
*I saw a great tip on Pinterest: see this easing line exactly on the seam line, then when you come to see the actual seam, you see exactly on that ease/gather stitched line, so it magically minimises puckers! (On my phone so am incompetent in linking but when I get home I’ll try)
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clip the arm scye edge on the body of the garment. Stretch the arm scye (gently) as you ease in the fullness of the sleeve head.
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I then pull the ease stitched line, and gather the sleeve head smaller than you think you’ll need.
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Pin twice as many pins as you might think you need! (And of course pin at 90 degrees to the seam line).
I start with pinning each edge of the sleeve to the body (ie underarm point). Then I pin the shoulder seam to the highest point of the sleeve head. I usually use 2 pins close together.
Then I pin, ease, clip, gently while trying to keep calm.
Then I see along the ease stitching
line - I sew with a 5/8 of an inch seam allowance.
Then press it out really fully. This is where a tailor’s ham is useful. But really stretch and mould and shape the fabric with steam and iron heat.
I tend always to add a small line of padding along the arm scye even if I’m not using shoulder pads - it gives a nice definition to the sleeve head.
The other way I do sleeves is to sew up the shoulder seam, but not the side seams on either sleeve or garment. Then I see the sleeve to the body easing etc as above, then I press hard, then I see the side seam of garment and sleeve all as one, carefully managing to match the underarm seam points.
This is a particularly good way to make shirts because you can do a neat flat-felled seam on the arm scye/sleeve seam and a French seam for the side seam of sleeve and body of garment.
But a tailored 2 piece sleeve can’t be done this way!
I do like setting in a tailored sleeve. There is something satisfying in getting that sharp defined shoulder line. This is where putting a little line of wadding (I use old jumpers) along the arm scye is also good (I learnt this from a blog about couture techniques).
HTH