I don't think any of them have time for shopping, and looking at their outfits (as you do) it seems it wasn't a priority before they left their home countries either
I love accompanying my Dh on business trips, especially to other countries and cultures.
We are a package deal, and a LOT of opinions are formed and decisions made within the group of women.
Most of the women I've met at ambassadors / business etc dos, have MBAs and higher degrees with a lot of corporate / entrepreneurial working experience, and voluntary work under their belts.
Most have kids, a lot of them may have taken a career break for a few years whilst their kids are young, and for the duration of whatever posting their (usually higher paid) husband is on, and most of them are really fabulous, intelligent, articulate, generous and engaging women.
WAGS they most certainly ain't. To say they just 'tag along' shows a real lack of understanding of how the world really works.