My invo is a mess.. there's no rhyme or reason to it. My storage on the other hand is fairly organized, but only because like items are typically grouped together.
As for the amigo stuff, summer tops, etc - I sell those back whenever there's something cheap I wanna buy and I'm low on gold or just need a little more to buy something. I put a lot of effort into not having to booty grab to get what I want.
The way I have my inventory set up its been hard to organize. So about the first three pages of my inventory is very organize but the rest is a mess. Maybe I'll try again.. in the future when I'm not lazy or now.. hmm
As for DC, ever since I got a pile of that teal summer shirt (ugh) I've been instantly selling any piece of clothing I get from the it.
My invo is organized by
4. langer the dragon collection
7. equipped items, they are organized by sponsor, animated, chance, MC, EI, color and random or recent items bought. Random is not yet organized.
8. towns: bugs, ink , flowers and garbage.
It is easier to find the evolving items I want thought.
My inventory is grouped by type, and organized chronologically within those groups. It goes like this:
Cash shop items
Rare event items
Gold shop items
zOMG! equippables (also grouped by map: Village Greens, Zen Gardens, etc.)
Game items for Towns, Fishing, Pinball, etc.
Aquarium fish and decorations
zOMG! rings, items, and recipes
Alchemy formulas and items
It's a lot of sections (I left out a few of the smaller ones from the list), but it makes it a lot easier to find stuff. I don't remember the names of all my items but I do remember icons.
DC junk ends up at the bottom and gets cleaned out every once in a while when I have to move other items into their sections.