This stuff is very like the buckram I got at Hancock Fabrics but the undercollar canvas is 60" wide. Hancock buckram is 20" for $3/yd. Vogue Fabrics 60" buckram is $9/yd. The 60" canvas from ATS is $5/yd. The only differences I can see are the canvas is brown, and it's a just a teeny hair less stiff. When I need it really solid I give it a coat of Alene's stiffener, or I zigzag two layers of the canvas together like Lynn McMasters shows in one of the hat patterns I use. I'd do those things with buckram too though when stiffness is needed.
I've yet to use it for tailoring, I go a little softer on my collars, but I use it for millinery, and sometimes in place of crin for ribbon work. Just thought I'd share!
Some pictures for comparison. The buckram is the white stuff.

Here's a close-up of the weave:

The buckram is a just a little bit stiffer. Here's how they drape over a fabric bolt:



