Our son added little clips between the pants and torso of a police lego man because "that's what real police officers look like." It didn't look quite right since the legs wouldn't fit into the torso with the clips there. I told him I would make a belt for him that would fit a little bit better. After a couple dozen versions this is the one that ended up looking the best. Prints well without a raft.
If you don't have a printer, feel free to order this printed from my etsy shop. https://www.etsy.com/listing/523783211/utility-belt-for-lego-people?ref=shop_home_active_2
Sharing for others to use for free for non-commercial use only, if you want to sell these, please contact me.