This is for paintball.
Head: JT Proflex (mask) & headband (right now i wear a custom purple one that says "Fatboy" on the tail ends). I wear a Buff around my neck if it's cold.
Torso: compression shirt w/ any ol' ratty tshirt over it (or tshirt & long sleeve if it's cold).
Legs: Dye or Proto pants. Wear trail runners (like a hybrid between sneakers & hiking shoes).
Protection: Eclipse arm pads, they cover my forearms & elbows. Got some old JT gloves if it's cold. Eclipse knee pads. The Proto pants have padding in "the most tender of areas" so i don't wear a cup.
Weapons: in paintball, nothing is a "weapon." It's a marker, because that's what it does - marks things (and people) with paint. I've got a few, but prefered would be any Matrix for tournaments (like a DM7 or so, really any of them), a pump for recball & pump tournaments (right now i've got a Trilogy Tactical w/ pump kit installed), and a Smart Parts Ion converted to mech for recball (couple guys online designed a drop-in kit that replaces the circuit board, so it's entirely non-electro).
I've got a Hub along the same lines: http://hubpages.com/sports/Paintball-What-to-Wear...