So assuming Infinite Money, and a tank class. Let’s go with a prot paladin.
You can get 252 gear from world quests in ZM. That’s technically (normal) raid level. I think the best weapon and shield you’re getting are from the Dune bosses which would be 246 ilvl.
You can get 259 helm and BP from the world boss in ZM. That’s high normal raid level. You can make this into tier pieces.
You can buy BOE Heroic plate hands and shoulders from the auction house, and make it into tier. This is the “assume infinite money” part of the equation. With the BOEs and World boss loot you can now have a 4-piece tier set.
Also buy a 265 BOE cloak.
You can buy one 262 crafted item. You get a 265 belt from the ZM questline, which can be replaced with a 291 legendary. You of course can equip a second 291 legendary.
With all of that gear, you might be able to solo mythic 0 dungeons for the “do 4 mythics for a piece of heroic raid loot” quest, every few weeks. Bam! Solo heroic raid loot.