Goku's Outfit - This is Goku's favorite outfit . It is called a "Gi". The symbols on front and back are called "Kenji" and they're King Kai's symbol. The outfit has a navy-blue shirt and orange pants. It also has an orange vest. The outfit also consists of weighted clothing, this way Goku can increase his power. They are later changed to white shirt and pants.
Piccolo's/Gohan's Outfit - Piccolo's and Gohan's outfit is composed of a white cape, white turban, and purple clothing. Really the outfit is Piccolo's but Gohan designed one exactly like Piccolo's. The outfit is pretty heavy, this way it helps Piccolo and Gohan increase their power.
Saiyan Armor - This is the armor that all Saiyans wear. Freeza, Goku, Gohan, Vegeta, Krillin, Nappa, Freeza's Henchman and all the Ginyu Force used it. The Saiyan Armor changes from time to time with better armor/protection.
Fusion Outfit - This outfit is used by Gotenks (Goten and Trunks fused together) and Gogeta (Goku and Vegeta fused). It consists of a black vest with orange around the armholes, black wristband, black belts, white pants and shoes.
Great Saiyaman's Outfit - This outfit was created by Bulma in the late DBZ series. Bulma made it for Gohan's purpose. Gohan wanted to be a super hero but in an outfit so nobody could know, but Videl, a schoolmate finds out. The outfit changes but very little. The helmet, which was part of the suit, changed to a white cloth because of the Tenkaichi Budoukai, which you aren't supposed to have any armor/protection.
Trunks' Outfit - This outfit is composed of gray pants, a black shirt with a blue Capsule Corp. jacket, a sword and sheath is carried on the back of the body. Note: This outfit is only worn by Mirai Trunks, not Chibi Trunks.
Best viewed in 800x600 res.