Chainsaw boots will help you keep your toes where they belong. Steel toe are a good second choice.
Chaps that wrap around your calf will protect you when carrying the saw, and the chance carelessness or stumble that brings the bar into your heels, ankle, calf. Wraparounds are nice in the underbrush too.
There is a shirt type artical of clothing that protects your shoulders and upper arms, very light weight, and has the kevlar in it to stop the chain in a kickback situation. One of the sponsors on the site carries it, check the sponsors listed on AS homepage.
Helmet with screen and muffs is great, and if you catch a glare from the screen, just spray it with some flat black spray paint.