I agree @MaMelon! I'm (very) late 40s & work in a creative sector & always have. I'm not conservative what it comes to style but I don't succumb to every passing fashion either & I, broadly speaking, know what suits my body so I wear things that I feel good in & that suit me (at least I think)
I no longer wear skinny jeans etc & haven't for quite a while now.
I just know that the tiered smock with white trainers & denim jacket is not for me & that's fine.
As for the question of what it stylish and comfortable? For me, in summer, it's well fitting dresses in nice fabrics, often plain, or small patterns, with leather sandals. The sort of look you might see on a French/ Spanish/ Italian woman in her 40s. It's harder to find here than you'd think!
Again I totally accept that this is only my singular opinion on what is stylish & comfortable.
I don't think most of the smock dresses are particularly stylish (again subjective) and I absolutely don't think cycling shorts / cropped tops / skin tight sports leggings / trainers are a good look either but I see them in abundance!