Curvy girl help

Hello- I am a size 6-8 but am built like a Disney mom (small torso but big butt/thighs). I am having the worst time finding formal wear that fits because dresses are either all fitted/straight fit and they can only fit my torso or my thighs. On top of that, most a-line dresses look older (think 40-50 yr old). I am in my 20s and I want to look cute/flirty/sexy but literally nothing fits the vibe. Please help 😫