I had an Ebay purchase gone wrong (only $30 out of pocket, so no big deal). Luckily the pants are cool on their own. But I digress. So, instead of trying to hawk the thing on Ebay (I doubt I could've gotten anywhere near back what I paid, if I were honest), I'd deconstruct it. So, here's what I found. The chest did have a "third interlining" of canvas and what appeared to be a soft cotton material draped over the canvas. But, then "fused" onto the front material was what I presume to be the "fusable material." I basically started tearing it off and it pretty much seemed like an iron-on patch type deal. You could see the glue residue on the wool. So, my question is, why would you need to put fusing like that when you already have a canvas chest piece? Honestly, it seems like the fusing might add some durability to the wool, which is a good thing. I didn't think that it made the wool all that much stiffer, and it was an old suit and I didn't see any bubbling. So my feeling is that the most important things are (1) a good canvas chest piece and (2) canvas in the lapels [this one DID NOT have canvas in the lapels -- it depended on the extra body given by the fusing]. But I just don't get why you'd need to put fusing in when you have the canvas chest piece (note: I understand why'd you do it in the lapel if you don't have canvas there, but why elsewhere?). Could somebody answer this?