Trim the seam allowance to ¼" under the arm about 2-3 inches on either side of the side seam. This allows for more movement and comfort. Don’t trim any of the rest of the seam allowance, which serves to support the sleeve cap.
How to Make the Perfect Coat: Sewing Sleeves in Jackets
On a typical jacket or coat, the collar, lapels or button closures are the stars of your garment, while the sleeves are more of a supporting player. However, this supporting role doesn't make precision sewing any less important. A properly sewn sleeve can be the difference between looking high-end instead of handmade. Follow these tips for precisely sewn sleeves on all your coats and jackets!
sewing coat sleeves - fleece strips for a sleeve head the sleeve heads fill in the seam support the fabric and helps prevent puckers. On lighter weight fabrics you can also use Organza/Organdy or cotton batiste often call lawn cut on the bias. Great tips but the blog has been moved here is new site: http://notesfromamadhousewife.wordpress.com/category/sleeve-head/