I am a similar shape to you, but I'm a sahm, so don't often need to dress formally, but the crucial thing for me is that everything fits properly, especially on the shoulders and I also often end up taking up hems and sleeves. I'm not overly fond of my bum and thighs, but I have a small waist so like to empathise that.
For you for work maybe something like Capri pants, good t shirt (got some good ones in Hobbs recently) or a silk sleeveless top maybe, Jersey blazer. I think the shirt and blazer sounds a bit masculine. I have a lovely lace top that I wear with a structured blazer, softens it, but it's not flouncy.
In winter I wear a lot of A line skirts, above the knee, opaque tights in the same colour as the skirt, ankle boots, fitted cashmere or merino jumper. You could put your blazer with this or a neat, Chanel style jacket. If I wear jeans, I go for straight leg and I have chopped mine off above the ankle and wear with ankle boots.
I like dresses like this, again make sure the fit on the shoulders is good. Me and Em have great clothes, they have goods sales and the occasional 20% off if you sign up for emails.
What I mean by round collar is a Peter pan collar, they look softer, they can be hard to find though. I spent years looking for a denim shirt with one, eventually found one in Zara.
Hope that helps!