Question about bias cut tartan waistcoats.

[Tarheel]

I notice the Butterick patterns offer extra darts in the front of the vest (illustrated in the photo I posted) that will slim the effect from underarm to waist. I expect there is more distance from the neck to the shoulder in the pattern that will further enhance the slimming effect.

I remember my grandmother would take a pattern, measure us children, and expand the pattern onto craft paper to individualize clothes for each child's shape. The clothes survived several years of "hand-me-down" use.