Open seams and stitch in the ditch?
 

I don't FMQ yet I SITD. I am making a throw for my couch and plan to try pressing the seams open to see how I like it. Can you still SITD with pressed open seams because you'll just be stitching over the stitches?
:sew::wave:

I wouldn't. It just doesn't seem as secure as pressing seams to the side and stitching over fabric. But then, I have never been happy with open seams.

I agree with toverly . If you thing with an open seam and the Sitd you would be sewing on the thread and not joining fabric. Press to one side and stitch as close as you can to the seam but not I it.

Are you machine piecing? If so then your seams will probably be strong enough for SITD pressed open. If you are hand piecing then, no I would not recommend pressing your seams open.

I would only press open the seam on vary rare occasion. SITD is very weak stitch if there is no fabric to hold the sandwich together. Beside, even if they have made improvement with battings, there is always the chance of your batting migrating thru the pressed open seam especially if your fabric is very dark such as black.

if you do, I would stitch 1/4 inch away from your actual seam on each side. not right on the threads.

I second that. If you try to stitch right ON the seam line (as there would be no ditch), you run the risk of cutting the seam line. Even just off to the side an 1/8th or 1/16th of an inch, would be better than on the seam. JMHO

I agree if you press seams open you should not SITD right on the seams but rather just to the side to catch the top and one of the seam allowances for strength. I never press seams open, I guess I have not done a quilt that needed them pressed open.

Consider it a form of echo quilting. Though you might want to try a bit of simple quilting with a practice sample and see how that goes, like orange peel. It all depends on the design of your quilt.