I'm a right handed pitcher and I wear;
Worth helmet,
full catchers shin guards with the flaps that protect the top of my foot & flaps that cover inside and outside of ankle bones,
Evoshield wrist guards, pad on pinky side of left wrist and on thumb side of right wrist,
Shock Doctor ultra batter's elbow guard on my left elbow,
Evoshield chest protector,
Nutty Buddy cup.
Oh, and sometimes I'm lucky enough to get the most important piece of protection on the ball, my Vinci glove. I've been wearing all this for a couple years now and the only stuff that has taken a hit is the shin guards, twice the flap over the outside ankle bone has saved me some real damage.
I can wear all that crap and it really doesn't hamper my fielding much, if at all. Only thing that is harder for me with the helmet on is getting over to first and finding the bag while I keep an eye on the ball, when I remember to anyway