Desert Ranger armor seems to be based on prewar riot armor, as seen in Honest Hearts, so you could make it look pretty damn close.
Another interesting thing I could see them adding is a random post main quest encounter. You find a supermutant wandering on his own when maybe a deathclaw attacks him and you have the option to help out or not, if you do, the supermutant actually talks to you, thanks you for the help. It would turn out his name is Marcus and he finishes the short conversation by saying "Hopefully I can return the favor someday" before running into the wastes.
It would be a nice way to tie Fallout 1 and 2 together, especially since Marcus does return the favor unintentionally by helping out the VD's grandkid in the future.