JC Penney has this cool faux-fur vest for that can be incorporated into lots of Halloween costume ideas: I can’t tell from the pic, but I am assuming the belt is removable if desired. They are not usually secured.
PAPA BEAR, MAMA BEAR, BABY BEAR: This would be a fun group costume for triplets or siblings.
For PAPA BEAR: Wear this vest over a tan or brown t-shirt, turtleneck, or long john top. For the bottom, use brown or black sweatpants, dress pants, or long johns (dye a white long john set if needed for the right color). For variation, pair a long sleeved dress shirt under the fur vest with a tie or bow tie and khaki school uniform pants on the bottom. Top it off with this bear hat from Amazon: