Q 99 Is there a way for a vampire to become immune to damage from the sun and daylight? I know there's an artifact, but I'm looking more for an item that all vampires could wear. Or even a feat.
Liquid Night... a limited duration alchemical substance. Think sunscreen, SPF 3000. Libris Mortis, page 74. 150gp and lasts one hour.
The full-covering clothing that snakeman830 mentions would work... Check out Libris Mortis, page 140: "Even thick clothing, as long as it covers the body completely, can protect an undead creature from the dangers of sunlight." Still, I had problems with how much of the face might be covered. Even a minor exposure to the smallest beam of direct light on the face should be a problem IMHO. For that, I'd use the "Blindhelm" from Magic Item Compendium, page 75. "This helm's face is a solid slab of iron, apparently allowing its wearer no way to see out."
Another option is to take 2 levels in Warlock for the least invocations Darkness and Devil's Sight.