An iPhone case with a belt motif is now available from Hamee. Advance reservations are accepted at the "Ketchup!" Store in Rakuten Ichiba. It will be released in mid-January 2017. The price is 2,000 yen (excluding tax).
The product name is "trouver Milieu hard case with belt", and it is available in two types, one for iPhone 7 and one for iPhone 6s / 6. A belt motif is attached to the compact hard case, and you can prevent it from falling by passing it through your hand. There is also a pocket inside the case for storing IC cards.
There are four color variations: "Navy", "Navy White", "Botanical Pink", and "Botanical Blue".