I personally think that it is a bit ridiculous to buy technical clothes from high fashion brands, because it won't be more efficient than the clothes designed by the specialized brands, it will only be more expensive.
And even from an esthetic point of view, I don't think that the technical clothes made by brands such as Fendi are more good looking than the ones made by the specialized brands.
I saw that Fendi launched a ski collection! In particular pullovers and jackets which resume the 'eyes' of Fendi.
The design is very nice and rather simple, not too "fashion", we could wear it for sport for sure.
Even if it's high fashion, I don't know if the price is justified, it's more expensive than technical brands such as Moncler for example.