In dire need of assistance

[GreasyHairDoNotCare]

So I am 17 and has my son 7 months ago and nothing fits me. I used to be size small/6-8.

Now I am more like a size 10 but with the inevitable mum tum and I have some serious pouch going on so nothing tight looks good. I used to wear typical clothes for my age, bodycon dresses and fitted skirts. I still like clothes like this but they now look terrible on me.

I am 5'2" at a push and quite petite overall but I have quite large 34E boobs. Please suggest things that will look good on me as I have a wardrobe of clothes I love that don't fit and I am mostly living in leggings, jeans and jumpers.

For reference I am quite fond of holly willoughby's style.

Wow, size 10 7 months after you've had your baby, sounds as though you have a lovely figure. Holly Willoughby always looks great and her look would suit most people I think.
You could start with the most obvious, make sure you're wearing the right size bra. Start with this bra size calculator, it's excellent.