May 62010 Video Tutorial: How to Make a Flat-Felled Seam By Jennie Chancey Posted in Tips | 2 comments » 2 Comments on Video Tutorial: How to Make a Flat-Felled Seam Carolyn September 17, 2011 at 8:17 am (611 days ago) Thank you so much for your instructions on how to create a flat-felled seam! I am creating the Chemise and am having trouble with the flat-felled seam under the arm. All those seam intersections! Do you need to trim in places in order to get them to lay flat? I am following the order you have provided but are still having troubles and would really love to see a demo on how to flat-fell under the arm. Thank you so much for your help! Reply Jennie Chancey September 17, 2011 at 8:25 am (611 days ago) Hi, Carolyn! I am going to email you the photo steps for the chemise. All you need to do is snip the very top of the side seam allowance after flat-felling the sleeve seams. That will help the side seam lie flat when you flat fell it. Hope this helps! Reply Leave a reply Click here to cancel reply.