Keep your person clean with scent free soap, keep your clothes clean with scent free detergent, store them in an airtight container, only dress in the field, away from your car, use a scent eliminator spray, approach your stand from a direction you are not likely to encounter deer or cross their trails as much as possible and hunt with the wind in your favor as much as possible and they are not a necessity.

To use carbon suits, you still need to do all the above. Carbon just adds another layer of insurance.

By the way, I use a scent lok liner suit, do all the above, and have not been scented by a deer, to my knowledge, for the past 5 years.