I think camo would be nice, after jamming all those fancy sensors, then you just need camos that will hide you from the visual sensors (eyes) of the enemy, tailored to their vision spectrum.
As for the much used "blow a mountain away" line, well, I don't think a power pack will last long on that setting. And your average rock is easier to vape than tritanium. I think what vapes a few hundred cubic meters of rock only gets about 5 cubic meters of tritanium. And if it's shielded, well, they know you're there and where you are from the phaser beam. As for "armor" I suppose starfleet would use something that deflected the blast or ablated away, at least taking the lethal sting and leaving the troop alive with a treatable (by 24th century standards) wound. And there is still shrapnel in the 24th century, at least exploding rock and ship bulkheads, I wouldn't be surprised is the standard uniform had some ballistic armor properties, but that's just what I would do, because it doesn't matter how peaceful you would like to be, there's always someone out there who'll try to hurt you. It happens. Now I'm rambling... oh.. 0130
better sleep
"Retreat?! Hell, we just got here!", annonymous American Marine, WWI
"Gravity is a harsh mistress....", The Tick