Sorry, that's the way I think of the seams. I'm sure most of the terms I use are my own - I am largely self-taught after all.
Perimeter seams - seams that join the 4 sides of the "box" to the base - as opposed to the main seam down the center of the bottom like a box you fold out from flat.
I've seen some people stitch a seam then press it open and then top stitch on both sides. That seems to me to be decorative - one set of threads to hold the seam. I was thinking I could do a sort of "cheater's" flat felled seam by pressing to one side and top stitching both sides of the seam. The stitches on the one side would be decorative, but the stitches on the seam side would be extra strength.
I plan to match my thread to the webbing really well and stitch the crap out of it! As best I can tell, it's a lot like uh,.. women's foundation wear. The band(s) on the bottom does 85% - 90% of the work, the rest is for stability.
