Originally Posted by Sartorially Challenged
What do you mean? Could you elaborate on that a little?
Seven-fold ties have a very different hand than your typical single-layer tie with an interlining (of canvas or wool or somesuch). I don't know where you're starting from knowledge-wise, so at the risk of sounding patronizing, I'll begin at the beginning.
Most ties you buy today are constructed of just enough silk to cover the outside of the tie in a single layer of fabric, which is wrapped and then sewn around an interlining of some heavier material to give the tie shape and body. A true seven-fold (or double-four fold, which I believe the CT ties to be) may have no interlining. Instead, a much larger piece of silk is repeatedly folded in on itself to give the tie shape and body. This results (in the case of CTs for sure, although it depends also on the thickness of the silk with which you've started) in a much heftier- and stiffer-feeling tie than most people are used to. It may not bend as well when you sit down, tending instead to stand up on its end on your lap a bit. Some find it harder to achieve a good dimple, if that sort of thing is important to you. They're also thicker, generally speaking, than a "normal" tie or the same silk. It was the stiffness and thickness that I was specifically thinking of.
Here is a pic of the guts of a CT seven-fold, in case it's of interest: