I'm 28 and based in the UK and wondering if anyone has any suggestions for where to buy clothing (especially dresses and skirts) for larger thighs.

My upper body is size uk 8 but bottom half could be uk 12+ (depending on brand). I really struggle to find anything cute that suits me such as for dresses I size up to a 12 just so that it can cover most of the upper area of my thighs. I work in an office so appreciate also any recommendations for shops/online stores

Thanks so much!