How to sew linear sequins
Secure the thread and bring to the surface at the position of the sequin. Bring the needle through the hole in the sequin and across the surface, bringing it down through the fabric at the sequin edge where the next sequin will be added.
Bring the needle back up along the stitching line half a sequin width along. Place the next sequin to overlap the first, take the thread over the second sequin and back down through the hole.
Pull the thread and adjust so that the sequin is placed half over the previous one. Repeat stitching and threading on sequins, each half covering the one before.