Should I use a garment after fat graft for lipoma removal dent?

I had fat grafting done to my left buttock to correct an indent from a lipoma and lipoma removal. My doctor did not give me a garment besides one for my torso for the liposuction done on my hips. I am 3 weeks post op and am noticing some build up at the bottom of my glute and this creates a divot in my buttock. I am nervous this will not smoothen out and am wondering if using a garment will help. Will getting a garment help ensure my glute is shaped nicely and help with contouring? Am I too late for this? What would I need to get if this is something I should invest in?