Connor Stalions is the lead culprit in the ttun sign stealing scandal. ESPN reported the former US Marine promised to bring marine tactics to sports for recruiting and intelligence, per his now deleted LinkedIn bio. A Yahoo Sports story quoted a source that saw Connor across the field with his 11x17 play sheet. 
A Ghillie suit is worn by USMC snipers and scouts to look like a bush. Available at Amazon and sporting goods stores for under $50. So the best 2023 costume is:

Ghillie suit, UM hat, binoculars around neck, holding 11x17 sheet with hand signals (sign language alphabet makes point). 
 

Let’s see those photos! Happy Halloween, 11W!