The first thing I noticed about this photo was Lord Ashbourne's hose. Look at the fancy patterned tops.
This is essentially the same fashion as seen in some of the hose we carry in the Scottish Tartans Museum gift shop, namely these:
Or, if you want to be able to customize your hose top, these hand knit versions:
Wearing hose with fancy tops has enjoyed recent popularity, and so some may assume this to be a "new fad." In actuality, it would seem to be a resurgence of an older style.