I've mostly given up on trying to make cardis work tbh! There's only one I've ever had which doesn't look frumpy - it's a super long line, thick Ganni one I got off Vinted. I think it works because I'm quite tall and it has a strong shape and holds that shape well? I think heavyweight knits look better for longline too - slim knits just look a bit cheap to my eye as a "jacket layer".
Anyway moving on from cardis... I've given a lot of thought to layers as someone who is constantly cold!
I really love nice sweaters. I think it's important to see them as part of the outfit you're putting together not just an extra layer? I've got some gorgeous Everlane sweaters I love that are super comfy. My personal preference is roll neck/polo neck styles and I have them in a variety of thicknesses to suit occasion.
Also don't discount a nice hoodie!
This is my COS hoodie which I love. I wear it with an oversize blazer/coat & tucked into tailored trousers or with leggings.
Blazers - I'm personally a huge fan! It feels a bit weird if you're used to seeing them as office wear. I felt that way at first now couldn't imagine my wardrobe without them.
If you want to be more on trend then go for boxier cuts and strong shoulders & avoid overly fitted, tight styles like the type you'd see in an workwear suit of the 2010s!
Coats - this was an adjustment for me as my coat always used to be an afterthought but now it's often basically my outfit 🤣 I love a nice coat. My classic trench is sooo useful as an extra layer in warmer weather and it makes me feel all classy & French too 🤣 for Winter, I have a longline puffer, a thick wool structured coat, a patterned wool coat & a long furry coat. So I have different warmth options depending on weather!
Shirts - I have a few classic cotton shirts in different colours and these are very useful for layering 🙂