OP, good posture, confidence, fitness and conversation certainly are for every day! Sexy is obviously in the eye of the beholder - I could wear an outfit that might give one observer the most disabling horn, while leaving another utterly cold.
As for everyday looks - well, in cooler seasons, I spend a lot of time in wool trousers, either thin and quite tailored, or heavier, tweedier, herringbone things, depending on what I have to do that day. I like silk shirts and cashmere jumpers, sometimes v-necked, sometimes polo, occasionally sleeveless over a shirt. I prefer things to be a bit more fitted than oversized, (but not tight) since I'm fairly narrow through the torso, but broad shouldered, so if I don't show my shape a bit, I can look like a block of flats. I don't really wear jeans. Summer trousers are a bit looser, but I still have proper waistlines and tailoring. I go for linen and heavy cotton in the warmer weather, little shirts more than T-shirts. I mostly wear flats, although I do still have a couple of pairs of heels for evening mincing around. I go for chunkier silhouettes on flats and fancy detail, as that stops my clothes choices, which are quite classic, looking too safe, I still want a bit of edge. I like dresses, and opt for simple shift dresses, not fitted, or shirt dresses. I still have a couple of wrap DVF dresses, which might wear with bare legs and sandals, but I am slightly chary of them these days - I'd wear them on the beach, really downplaying them, as they do suit my shape, but I just think they can come across a bit try-hard.
Have you been watching Criminal Investigation on Apple? With Peter Capaldi and Cush Jumbo? I like the way she dresses on that show. I like elements of Victoria Beckham's style, (but her clothes are out of my budget, I need to find ways to cheat!)
As for brands, I like MaxMara, Gerard Darel, Eric Bompard, COS, the odd bit of Ganni, Mother of Pearl trousers, not their tops. I want to like Studio Nicolson, but their woollen trousers seem all to be 55% polyester and the one time I ordered a skirt I returned it because although it was 3 times the price of a similar one by COS, it wasn't three times the quality. Hobbes makes its way into my wardrobe occasionally, as do Everlane silk shirts, now that Jaeger is a bit shit. People tell me good things about Zara and Massimo Dutti these days, so I will probably look again at those. Shoes/sandals/boots/trainers are a mix of Russell and Bromley, Marni (when I'm feeling flush, which is rare), Adidas and John Lewis AnyDay.
My preferred brands aren't especially cheap, although by no means top of the range, so I buy rarely and make it last. I've items in my wardrobe that are 20 years old. This means that if I gain 3kg, I prioritise getting it off again, and soon, so that I can keep wearing tried and trusted favourites.