I think it depends on income and life circs, like elsewhere, as well as interests.
The Dutch and French women I know who surf aren't interested in getting their nails done. You wouldn't differentiate them from each other (although Dutch tend to be taller and blonder, but not always).
I also know conservative, older generation French, Dutch, German and Italian women who wear a uniform of makeup, shorter hair, shirts with cashmere jumpers, trousers (rarely jeans) and expensive jewellery. Shoes along the Salvatore Ferregamo lines. Sometimes Repetto. Wear trainers that look to me like they're Geox or Gabor (I have no idea).
I see a trend of "sad beige" with mums in their Kate 20s, early 30s. Kids especially are dressed in it. A lot of effort goes into looking like there's no effort - and expense into looking like you're hobos! That's more the Northern Europeans.
I don't see one nationality as better groomed. Mums who are rushing between work and school and a DH who notionally pulls his weight, with no other support simply don't have time to be getting their nails done. It doesn't matter where they live. Those with time and/or money to spend on clothes and grooming often do invest more of both in it. Just like in the UK.