I was told the complete opposite when I purchased my jort from soho store. Jort only full canvas construction suit otr. You can have full canvas on mtm sienna. I was not interested as then it is in the price of the jort which fits nicely with minimal alterations. If you look at fit info for siena no mention of full canvas construction other than "canvas construction" on the video. Jort /spalla has it written full canvas construction on the fit info.