Best procedure to flatten stomach after c-section??

I am 11 months pp and am embarrassed to say but I am having insecurity issues with going out. I now hate going shopping bc I don't know how to dress for this body without it being oversized...I am weaning off breastfeeding... walk with my son everyday...go to the gym... I can't take the depressed feelings anymore. I want to feel confident again. I used to be a small up top and large on bottom...it was perfect loved my body now I'm wearing between an XL-2X top depending on what I'm buying.. never in my life did i think I would shop in plus size 😢 I also wear a waste trainor when i go out..I just want that confidence i used to have...If anybody has any advice about procedures that work and are safe I would love to hear or even see before and after pics if you don't mind.