I'm older than 50. I live near a wealthy conservative town. I didn't check the ages of the other shoppers.
I have FatFace jeans and like them. Didn't think it was my kind of shop. Same goes for the others you mentioned. I think of those as shops where I'll get clothes that will last and last from.
If I want a nice top for a night out, I'd probably try Zara, H&M etc first. (I do feel a bit old in some shops
)
The shops I expect to find something in are the likes of Jigsaw, Mint Velvet etc. They usually disappoint me.
If I want a decent t-shirt I'd go to Seasalt, jeans FatFace or M&S, something a bit quirky or only to wear once or twice New Look etc
If I want to get something good and shops where I walk in and think 'This is my kind of shop' I go to the very nice wealthy town a train ride away. Can't afford the clothes but I can aspire.
I'm a bit protective of some brands (and might think quietly that they're far too frumpy for me) because on here posters have different lifestyles and budgets. I also don't really find Gazelles/NB/Hokas any less frumpy than Skechers.
@BoogieVoogieAllNightLong , she makes some good points and the gist is good but she lectures a bit and some of her outfits are terrible. Take what you can from her. Justine Leconte is good IMO.
Maybe Marie Anne reminds me too much of the French Women Don't Get Fat author.
French-wise, I'd like to look like a younger Ines de la Fressange.