The waistcoat is nearing completion, save for closure and collar. I have sewn the two front pieces to the back at shoulders and sides. Since all three pieces already had finished edges I was able to quickly whip-stitch them together. This is how I did it:
This technique is possible when all pieces have been sewn together separately, outer fabric with lining, right side facing right side, then turned inside out. Now you have lined pieces with neat edges since the seam allowance is hidden between the layers. The garment is then assembled in the way I described above. Somewhere online I saw a linen shirt (or shift) done this way, only that the edges were first hemmed and then whip stitched. Is perhaps easier than using the backstitch and then binding the seam allowances? Does it make sense? Have you tried this? And if so, did it work?