A new trend amongst men, using tights, either full length, half length, or 3/4 length, when training. Either pairing it with shorts, or just wearing the tights alone.
For example, the 501kg deadlift from Hafthor.
The first thought is actually, if you’re going to dead lift, using a Street bar, either conventional or sumo style, to maximize the efficiency of the bar travel, it will probably either scrape your shins, your knees, or your thighs. Therefore, wearing full length tights seems to make sense.
However, if you see somebody doing a deadlift with a trap bar, like big boy doing his thousand pound trap bar deadlift, because the bar doesn’t get in your way, it seemed like he was able to do it fine with just normal athletic long pants.
My experience
My personal experience, that lifting 540 pounds of the trap bar, and also doing a 540 pound micro squat with 540 pounds is this:
It seems ideal and optimal for me to do it, with my shorts all the way rolled up, having maximal thigh flesh freedom.
You don’t want clothes, or body parts to get in your way
So, assuming you’re just doing trap bar deadlifts, and normal straight bar squat, then, the ideal is to have some sort of tights, which are maximally short as possible. And even, when I roll up my shorts all the way up, the fabric in the shorts pockets gets in the way.
So in short, either get a pair of short shorts, maybe running shorts, or something you can roll all the way up, and allow maximum leg, flesh, thigh, and hip exposure.
No more good reason to get full length tights or leggings.