I was about to say I don't do this but I kinda realized I do once I was halfway through typing this. lol so here's how.
I carry two necklaces, one with a Fortify Archery enchantment (that I will put on with the Dark Brotherhood cowl to get max archery damage to fight dragons with) and one with an underwater breathing enchantment in case I want to dive deep underwater to get a random treasure chest or explore a shipwreck without worrying about casting the corresponding spell over and over again - or drowning.
I also carry different weapons for different situations. I carry the Nightingale Bow (shock and frost on one bow is very useful), and a fire enchanted Nordic bow, as well as an unenchanted, fully upgraded Dwarven crossbow. I carry arrows of varying quality and bolts of various quality including the Exploding elemental bolts from the Dawnguard. I also carry Dawnbreaker as it works the best on undead, Dragonbane for dragons, a shock enchanted Nordic sword for use on Solstheim where most of the enemies are fire resistant (for whatever reason I dislike using Dragonbane for its shock damage and prefer to use it only on dragons), and finally a firey soul trap enchanted Dragonbone Mace to fill soul gems with to recharge all my weapons.
As far as armors go, I tend to stick with Vampire Royal Armor with Nightingale bracers and boots with either Morokei or an enchanted circlet, and enchanted ring, for added magicka regen. I probably won't change this set up until I get my Enchanting and Smithing maxed out good enough to make myself something better.
As far as resists go, I just carry resist magic, resist fire and resist frost potions on me. One less piece of equipment to have to carry with me.
I really only do this on my main character though. Maybe it's because she's my first playthrough and that's how I learned to play on that character, maybe because she's a mage and a bit of a jack-of-all-trades. But on my others, like my warrior or my thief, I don't do this. Go figure.
But nah, you're not alone on that.
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