Your shoes are letting you down, I feel. You need smarter shoes. Or decent ankle boots. The knee high boots from a photo upthread are too wide in the calf imo.
The wide leg trousers are fabulous on you.
If you choose leggings or jeggings, I agree with some PPs that you should consider tunics. You could find some boat neck ones.
Shorter, tunic style dresses can look very good with a contrasting jacket that is short (ends at waist, not at hips). Think small leopard print tunic with a black leather or vegan leather jacket, and black booties.
Your tops are all the wrong length - not short enough, or not long enough. The pulled over the hips look isn't flattering. Nor is the tucked in all around look unless you have a coat or jacket over the top. Tucked in at front only is nice.
In general, the T-shirt style tops are not good unless under a cardigan or jacket. The Breton stripe was nice (but tuck it in). The boat neck red/burgundy was lovely. The boat neck suits you really well.
Little teal cardigan - lovely. If it was even a little shorter it would be really stylish.
Jumpsuit - fantastic.
Fuchsia jacket - gorgeous.
Coats - really, really nice. Great lengths, lovely styles on you, nice colours.
Try some boyfriend jackets for over trousers, both wide and skinny legged. They are longish. You could even do straight up and down, or just very slightly shaped. A BF jacket with one button closure could look lovely on you.
Shorter jackets need some standout feature - like very wide lapels, for instance, which balances the width at the hips. A plain top tucked in underneath (boat neck) would be enough. A shorter jacket needs to be short though - no sitting at the widest point of the hips.
Jackets that go over the backside and have a rounded as opposed to square bottom at the front are nice for wider hips/saddlebags.
Look for tailored jackets in heavy knit fabrics - they can look like businesslike cardigans and nobody will mind if you don't peel one off in a meeting. A jacket like that with horizontal stripes can look nice over wide legged trousers.
Boxy tops have to be short and fitted, or worn with the front tucked in.
Otherwise they are just flappy tops, not a good look.
(And you are right, you need a belt or two).
Try some flowing, longer (to knees) cardigans in flattering colours and drapey fabrics, nothing bulky. Get black ones to start with. They will go over your tighter fitting dark jeans and jeggings and any darker tops you have. They could also be worn over a tunic style dress. Wear with nice boots or booties and a well tied scarf in a feature colour if you choose a monochrome black/dark look.
You need some eye catching scarves that are carefully and elegantly knotted, to decorate your boobs. You need a few colours so your scarf will complement your top.
You need to accentuate the boobs to balance the hips. The boat neck tops look good because they allow your boobs to shine. Get a really good bra that supports you well. Tunics could be very nice on you, especially slightly A-line ones.
I liked the green floral dress a lot. Also the shiny A-line skirt, and the velour dress. The blue floral dress is too summery to wear with dark tights, boots, etc. but it's nice on you. Keep it for summer.
www.navabi.co.uk/the-style-curve/shape-advice-en/how-to-dress-wide-hips/
There is some very good advice here about dressing your shape.
In particular, the tops pictured here would be lovely on you. There is a yellow top with a shape that I think would bring you to a different level altogether with any of your dark skinny jeans or even wide legged trews. The A-line pink tunic shape would be gorgeous on you, especially if you tied a little scarf at the neck.
Look up French scarf styles, different elegant knots.
For your hair - get it cut.
Go with a kickass pixie cut, get rid of the old colour. When you find out what is causing the allergic reaction you may well be able to add colour to the pixie, to give it some depth and dimension. You can wear a bigger, bolder earring with a pixie cut. Nothing enormous, but it doesn't have to be a demure little stud.
Celebrate the body you have - don't fixate on how much better you would look 'if only I lost weight'. Best foot forward. Life is too short to be so critical of yourself.