I never competed in any powerlifting event. I would say that if "raw" means unaided/unprotected then no belts, not bouncy straps or suits or shirts, no straps, no sleeves no ace bandages, nothing but you.
When I did bench pressing I raised both feet off the ground and crossed my ankles with legs bent at 90 degrees. This removed any possibility of me arching a ridiculous amount or of my ass coming off the bench. I wore sweatpants to squat in and tennis shoes. No board beneath my ankles. I also used ace bandages and a 4 inch belt but I had been challenged to do my squat workouts sans any belt or ace wraps and did so easily. I used very light weights for sets of 20 or more reps.
One piece of equipment that many powerlifters feel can "save you" in later years if worn diligenntly all your career. You know how the hips go eventuallyon many powerlifters. So the advocate "briefs" always when deadllifting. The briefs are just like the bottom half of a squat suit, like extremely tight ball crushing underwear. I took to often wearing briefs where I'd cut off the top half of the suit. So many swear it saves the hips. I got maybe 10bs worth of extra pop from the bottom, hard to know exactly, but it does feel more forgiving, more stable, stronger.
Regarding suits, when I first tried someones deadlift suit in 2008 ,after a few practise sessions it gave me 115lbs on my max conventional.! My max was exactly 660lbs at that time.That's pretty much unheard of, sumo yes but sone don't get this even with sumo. Then there are many who don't get anything from a suit conventional. After this I trained for a decade until I could do my then suited max raw. Some know nothing said I hadn't gained anything, max was still the same, "but you don't understand, I've gained 115lbs on my raw deadlift!" Lol. Then the curious thing, trying on the old suit again it didn't give me anything extra! Very weird. I thought I might get 100lbs again, which would have landed me at 870lbs lol but I lost the benefit.
Regarding belts, I always deadlifted without a belt except for 1 rep max PRs. Then I wanted any possible advantage. I know they sell 2-3 inch sturdy powerlifting belts. Never got around to buying one, but the 4 inch can sometimes cut into your hips in the start position, make it too hard to breathe etc.