What I propose they adjust thermal to:
a) just show hitable areas on any camouflage (hitboxes) or
b) have a tapering off effect that shows hot in center mass and fade out to areas that cannot be shot (cool areas), just like IR/thermal imaging .
PS Sch4effer: Ghillie suits wouldn't show all heat signature only parts directly in contact with skin would get heat transfer, not equal heat transfer throughout the whole suit. By that note if you are comparing to actual IR/thermal scopes then it would signify differing heat strengths on the enemy, not all one solid colour.