Uniqlo is good for basics IME. They have a good range of basic items, lots of which are in natural fibres. But, they are very plain. I don't know how they would fit with Parisian chic tbh, as the cut of their clothes really hasn't impressed me. The odd occasion when I've tried something other than a cotton tshirt / top, a wool jumper or jeans, I've found the cut and quality a bit crap. But when I want a v neck merino sweater or a big cosy lambswool one, or a nice fitted long sleeved tshirt, and I don't want to spend ££££, they are the best.
There is a Parisiennes thread running at the moment. I bet they are not all size 10s on there. Maybe someone on there could advise. I had &other stories recommended to me before for that sort of french style, but they only go up to a 16 I think. So I'd also love to know where an overweight Parisienne would shop!
When I lived in Paris, I saw loads of overweight women btw, so the whole "French women never gain weight" thing is bollocks. It might be that it is less common, but I met a good few larger women there who were all native French speakers with what sounded like Parisian accents.
However, when I was shopping anywhere naice in Paris, I remember feeling like a dick as they never carried my size, which was only a 16 or so! I remember trying a size 14 dress on in a shop and asking the assistant for a bigger size. She smirked and said, "non. C'est le maximum" 🤣. What a dick she was. No need for the smirk. Harrumph! This was in 2006 - 2007, so I bet they carry bigger sizes now. But I digress!