Wow you sound very lucky with such a figure! I definitely think you should keep to the forefront of your mind what you said- that you want to steer away from conservative / boring cloths. It's really easy to slip bank into your comfort zone. When Coronavirus restrictions are over I would recommend you visit a stylist for free at Topshop. Though it might not be your shop of choice, they are more fashionable and will get you to try on a whole bunch of stuff you'd never pick out for yourself, which is what you need right now.
In the meantime, for hourglass, big boobs, slim waist, petit...
A decent bra is what you need! One that makes you feel sexy. Plunge is best for cleavage. But I've that keeps you secure and is the right size. Don't use M&S as their sizes are awful. Debenhams sizes are good and they have a decent range (but beware as they also stock a lot of frumpy styles) and Victorias Secret do more luxurious stuff. High waisted Brazilian knickers are good.
Waist waist waist! Lucky you! It's all about the waist. High-waisted pencil skirts / high-waisted tight midi pencil skirts are your friend!
V-necks will help your boobs look in proportion. The neckline on the dress you posted on your Op is the opposite of what you need. Was also unflattering on arms.
Have you got a decent pair of tight high waisted jeans? This you can wear with everything- cropped tight sweaters, v-neck t-shirts, blouses, shirts, blazers platform trainers, heels, boots. (Only wear blazers with a fitted waist).
Try wearing a belt with everything.
Dresses- tight / bodycon midi with scoop or v-neck, midi tea dress with v-neck and belt. Wear with tough ankle boots, suede boots or white sneakers.
Also for a smarter look, high waisted wide leg trousers with cropped tops and a belt would look great on you. Or high waisted belted tailored trousers / cigarette / paper bag waist style.
Yes to accessorising with your lovely leather jacket. Look on some of the "trendy/high street" shops to stock up on accessories- Asos, Topshop, even New Look and H&M as you can get ideas and then purchase somewhere more upmarket if you prefer. X