Gryffin, I love the look of the two you have found.
I wore vests/waistcoats a lot in the 70s and 80s and would really like to do it again. I wore mine with anything from dresses to jeans. Don't think I ever wore them as tops under blazers, but I would like to try. I know I don't feel and look great in V-necklines, but simply wearing a visible round-neck necklace would help.
L'Abeille, a great reminder! I had almost forgotten that in the old days I actually bought some of mine in the men's department, and at very reasonable prices (because they just wanted to get rid of the smallest ones, I think). The style of vests/waistcoats I like have been absent in the ladies' departments for years, but now I am going to take a close look at the men's soon.
Thanks for the inspiration!