Flat felled seams are usually used for men's shirts at the side seams and the armhole seams (as well as jeans as you mentioned).
1. Sew at the seam line right sides together.
2. Trim one of the seam allowance narrower.
3. Wrap the wider seam allowance over the narrower seam allowance and top stitch it down.
Flat felled seam will be less bulky than stitched-down french seam. (one layer less)
If the sleeve head is not too high, you can totally put in the sleeves flat (sew the shoulder seams of the bodice, then attach the sleeves "flat", then sew one continuous seam from cuff to hem) instead of setting in (shoulder and side seam sewn, sew the under arm seam of the sleeve, then sew the sleeves in "round").
If you can put the sleeves in flat, then it's easier to flat fell the side & underarm seams too.