Sew along for binding in the flat...

Here's a tutorial for how to do binding in the flat.

Here my tank top front and back pieces with one shoulder seam sewn together. (when you're sewing in the flat you only sew one seam together before attaching the binding)

Before sewing one the binding I adjust my stitch width on my serger to the widest setting.


Take your binding strip and lay it right sides together on top of the neckline for the shirt.
I leave my binding strip overlapping a little bit so that it's easier for my coverstitch machine to grab it later on.

Start serging it on, gently stretching the binding as you sew.

Here it is once it's all serged on.

Turn the binding strip over so that it's now covering the threads.

And turn it down once more so that it's now looped to the inside of the shirt.

Now coverstitch (or top stitch however you normally do) the binding in place.

Now take your other shoulder seam and serge it together.

Stitch that seam down, I always do it so that the seam in pointing towards the back of the shirt.

Here's what it looks like once it's stitched down.

And here's what it looks like when you're done.
(Obviously the whole shirt isn't done, but the neck binding is.)
If you're binding the arms (like I will be because this is a tank top) then apply the binding to the arm holes now, coverstitch it down, and serge up the side seams.