Oh yeah, I was thinking if you had to hide a whole base of operations, command post, resupply depot, or sentinel outpost.

If you're on the move in a scenario like this, then you'd need to have some means of taking down a drone, and hope to high hell you won't need to use it.

Mud is a decent insulator so you could smear yourself with that. In the winter you could wear quilted fabrics under a windbreaker. Basically the more insulation keeping the cold off your skin, the more it's keeping your body heat from being visible to IR.

I also think glass blocks heat radiation to some degree, so maybe using that as some type of parasol or shield, but that might be less feasible. Lining an umbrella with a survival blanket might be possible, but again test it with your own IR lens to be sure