Back in 1e/2e I had a wizard that had a long coat made with a hundred pockets in it, just so he could cast
Deep Pockets on it. (That was the base spell for Bag of Holding back then.)
It was made with pockets in the front, pockets in the back, pockets on the inside, pockets on the outside, pockets on the sleeves, pockets in the pockets, pockets everywhere.
The "pockets in the pockets" part was a problem, according to the DM. Or an opportunity, from his point of view. There was a Boggle (what we called a "Blue Gunky" at the time) who fell in love with it. Boggles can create doorways through space in 1e/2e, any time they have an opening. To him my coat looked like a hundred room mansion, with space twisted into a sort of multi-dimensional habitrail. He moved in. And re-arranged things, all the time.
And since his ability included the capacity to pick pockets at a hundred feet, I'd occasionally find things in there that I had never put inside.
On top of this, my character, recognizing that this coat was an incredibly tempting target for pickpockets, cast
Magic Mouthon each and every one of the pockets so they'd snarl and snap at anyone who attempted unauthorized access. (The spell said if the target item had a mouth like opening, it would animate to mouth the words of the message.)
Someone other than my character made it permanent, and they included the
Magic Mouth spells.
Came the day an Aerial Servant came looking for Irving (the Boggle) over a stolen chess set. The scene was interesting, to say the least. A skinny Elven Wizard in a long blue coat walking calmly through town towards the Court Wizard's tower, chess set in hand, while the Aerial Servant chased Irving from pocket to pocket, while the coat barked, snarled and snapped at it constantly. If you've ever seen a Chuck Jones cartoon, they you're probably getting the same visual that we had at that table.
Nobody in that town ever questioned what they'd seen. They didn't want to know.
