Well. I doubt that not having any gear but being skillfull will make you win any fights.
There will be things you gain from equip and a larger variety of skills from the widom tree.
So a newb that starts out or the ganger which is naked, have less chance to kill ya.
But there's a chance, as the game isn't like.
Super gear 100000% HP and DPS buff.
Noob gear, lets get swatted...
xD a new guy wil be able to fight and maybe win against an old guy, if he's reaaaalllllyyy good.
But that will be rather ... rare.
I think it will boil down to two things.
Gear will be good, but not necessary. The extra you get from gear makes your playstyle synergize better. Then someone going out with an tablespoon at you.
Skills. Having a definitive build versus a freshly hatched player. Is a advantage in itself.