It varies all over the map for me, by character. My Conjurer mage, who recently died, had Fortify Magicka and Shield effects (courtesy of sigil stones) on everything. She needed this because she had a non-mage birthsign and used no Restoration or Alchemy.
My favorite Warrior, Fortja, wore unenchanted light armor, the Escutcheon of Chorrol, and a couple of rings she acquired with Reflect. She mostly used a sword enchanted with Absorb Health, and a second sword enchanted with Soul Trap (sigil stones.) By the time she was "retired," she had most of the stuff you get as quest rewards, having done every major quest line except Thieves Guild and DB. That's a lot of enchanted stuff, and she occasionally wore the Crusader's Armor or the Imperial Dragon Armor.
Wild Elf wears just an enchanted Amulet that makes animals like her. And a sack-cloth shirt, not enchanted. She uses a fine steel bow and whatever arrows she finds, almost always poisoned.
Etta, who is level 1, has just found a Robe of Glib Tongues, and she's wearing it, along with fur boots, a fur shield, and a steel cutlass. A real fashion statement.