Shelley shows us how she tinkered with the tension settings on her overlocker to get a pretend flatlock seam. See an example of the results on an Oliver + S Field Trip Raglan T-shirt modified into a dress.
Sewing Seams that Look Like Flatlock
How to Flatlock on Your Serger or Overlocker - Sew a Flatlock Seam - Melly Sews
Sewing Seams that Look Like Flatlock
How to Do a Faux Flatlock Seam, Blog
How to create a strong faux flat-lock seam with an overlocker. - Bobbins & Buttons Fabric Shop Leicester, Sewing Patterns, Sewing Classes
Master the Three Thread Flatlock Stitch for Quilt Piecing - over the edge
How to perfect the 3-thread flatlock seam - The Last Stitch
Flatlocking: A Tutorial from Sew Journers - Hey June Handmade
How to do a faux flatlock (for hems and joining seams) – Pattern Fantastique
How to Do a Faux Flatlock Seam, Blog