Are the straps you mention what I've picked out with the red lines.
If so, the straps seem a lot longer than Sitzman's bag.
That image was a crop of Dennis' image. I think this was the first version that I could see clear resolution of the two straps, if that's what they are. Tonight I went through the Sitzman/Hesters scenes of Zapruder's film. I wondered too about the length of the straps and spent some time tonight researching women's purses. I guess I'll start getting ads for those LOL. I have to remember there is a lot of vertical motion blur in Towner3 and maybe that may make the straps appear longer. I also noted that her scarf was sometimes fully in view from behind, but other views the wind had blown it mostly to the left (north) side of her neck. That would be her right side in the Towner3. Thanks for looking into this.