I wore knee-high compression socks after my c-section and found them really helpful for the swelling and to keep the blood flowing properly during recovery. The thigh-high ones are honestly more of a personal preference, knee-high did the job for me and was more comfortable to wear around the house, but some mums prefer the extra coverage if they're worried about clots or have a family history. I'd say check with your gynae or the hospital staff before you deliver, since they often have specific recommendations based on your risk factors and what works best post-surgery.
can try TMC tho I did not wear after cs