Jennifer Parker's vest (but in white)! It's a Georges Marciano for GUESS vest. This white version is style #64869 and cut #3394. Just need to dye it the right colour. I noticed that on Claudia's vest the quilting is going in a different direction to Elisabeth's and also the squares/diamonds seem to be larger and therefore spaced further apart on Claudia's. The quilting on my vest is the same as Claudia's (see comparison photos). Also the "GUESS PRODUCTS" tag should be stitched closer to the edge of the pocket but I've had to temporarily remove it for the dyeing process anyway so changing its location won't be a problem.
Also, I'm going to assume that the style number for Jennifer's blue version of the vest ends with "869". Her white shirt, which I bought recently, comes in different colours but all of the style numbers end with the same last 3 digits. Only the first two numbers are different, depending on the colour of the shirt (see last photo). So assuming that the same thing applies to the vest, the style number of the blue version would be ??869.