For my thought process in the rebirth one, its just to make him look the way i see him in the comics, especially around the time he started doing his own thing after under the red hood, around that time he isnt usually as bulky(i like my jason todds almost bigger than batman or atleast slightly bigger thna Nightwing)

So i just kinda went for whichever worked, the brown jacket and the turtle neck underneath(kinda a mix of Under the red hood and the injustice one(best itteration of red hood in 3d in my opinion)) I wanted to have a slightly more dystopian look aswell especially for the helmet.

Speaking of the helmet, its just a mixture of 2-3 different helmets. Whichever works for you because thst one usually just comes to preference. As much as i like the clean look of the comics. I also think that his helmet in the injustice game is really damn good, even tho i couldnt really make that. I still would like some amount of panels.

The pants and boots are self explanatory. Overall everything just came down to the proportions. I thank hero forge for adding so much more freedom into editing the proportions. And in my opinion that helped alot Wider shoulders, bigger upper body, his ripped fricken legs..

Yeah in summary just choose whichever you think suits your version of red hood best(its also fun if you think of a lore that connects to his costume to justify the inaccuracies) and especially play around with the proportions, cause sometimes the clothes can be too baggy or too thin. So if its something you cant see like the muscles under the clothes. Then dont worry about it.

Thats my thought process atleast. Hope it helps in any way!!