Clothing and protection in cricket differs a bit between one-day and first-class cricket, but the basics are usually the same.
Most visible for any cricket player is his uniform.
For first-class and especially Test cricket, these uniforms are usually very light-colored if not white (so the red ball may be seen against them) with very few markings on them (no names or ads--usually just a team logo).
One-day cricket uniforms can come in an assortment of colors (usually bold or dark so a white ball may be seen against them) and are usually adorned with name and number on the back (like most team sports) along with various advertisement logos.
Cricket players are usually allowed to wear simple hats or sunglasses as needed.
Cricket allows for the wearing of protective pads and implements, but most of these must be worn under the uniforms and not be visible. There are exceptions:
A protective helmet with face guard may be worn as deemed necessary, always by batsmen and usually by close-in (eg. silly) fielders.
Batsmen and the wicket-keeper are also allowed to wear pads over their shins.
The wicket-keeper is the only fielder allowed to wear gloves. Batsmen always wear gloves.