I have been sewing for many years now! I used to get so frustrated trying to add set in sleeves until I came across this helpful tip; first stitch with regular stitch length from underarm area of sleeve to the notch.
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"Sleeve styles that are popular vary with fashion. Sleeves may be set-in, raglan, kimono, dolman, etc., etc. But whatever the style, there are some guidelines that will help you determine how the sleeve should look. The most popular style sleeve is the plain set-in sleeve.