Clothing shops? Online? Suggestions?

[Woopdedoo22]

I usually wear skinny jeans and a knitted jumper or hoody/sweatshirt, which I feel looks scruffy. I often go for boohoo or H and M which is pretty much just the same style of jumpers in a variation of colours.
How can I alter my wardrobe whilst keeping warm (I get very cold)?
I want to look like I have made more of an effort. I have just purchased some over the knee flat suede boots as an alternative to trainers!! What other shops/items would be a good start?

[SpongebobRoundPants]

Asos is a life saver. Free delivery and returns too