I keep all of my legendary guns and legendary armor, the clothing and armor that I swap between, and guns that I swap between in steamer trunks at Home Plate. It's fairly centrally located so it typically doesn't take long to get there. I keep them somewhat separated to keep it organized.
I've got trunks assigned to the following categories
-Legendary weapons
-Legendary armor
-Clothing/outfits that I swap between (Kellogg's Outfit, Silver Shroud, Reginald's Suit, and many others)
-Armor that I swap between, which is mostly fully modded suits of Combat Armor, Sturdy Combat Armor, and Heavy Combat Armor for the most part, along with all of my legendary pieces of Combat Armor. I also keep my under-armor outfits in here (Vault Suit and black BOS Officer Uniform)
-Weapons that I swap between (including the legendary guns that I actually use)
-Companion gear, since I like to change my companions outfits sometimes. In this one I have some more Vault Suits and BOS Officer uniforms, as well as fully modded suits of combat armor for my companions
I've found that keeping this organizational system makes it a lot easier to quickly find exactly what I'm looking for. I have hundreds of guns stored in my workshop at Sanctuary, and if I were to take the time to actually scroll through it looking for a specific thing it would take some time. As it is, it takes a solid minute to scroll to the bottom of the list.