I think I only have tools in my inventory at the momemt, but I might have a few other random items as well. I usually either sell or store items pretty frequently so that I always have free space in my inventory.
Materials, but clothes are right up there, too. I only have them for Label outfits...otherwise, I change every couple of days. Just another way my AC life matches my IRL.
Definitely clothes. I have way too many, and having shirts + pants + dresses + shoes + socks + bags + umbrellas + accessories + etc really adds up!!!!!
Next would be furniture, and then fish/bugs I have saved to sell to CJ/Flick and give for models
I've been crafting a lot of my DIYs for decorating/catalog purposes, so I finally got rid of a ton of materials, but now I have too much furniture. And of course, clothes!
This is referring to pockets, not storage? If so, usually I always am carrying at least one of each tool, customization kits, and a wand. Sometimes, I have clothes to deliver to Mary (secondary character) or furniture to bring home, but only the tools are guaranteed to be in my pockets (unless I'm selling turnips).
In my inventory the only thing I really keep there is tools. One of each plus two extra fishing rods, one extra net, and an extra shovel.
In my house storage, definitely clothes.