Who knows whether to wear a bathrobe or a bathing suit to soak in a hot spring?

Hot springs generally have public bathrobes.

There are so many people there that it is generally impossible to tell who is who when you go ashore.

So you don't have to bring it yourself,

And slippers,

But you should bring your own bathing suit. It is used to soak in hot springs.

Finally,

Mind you,

The water temperature in hot springs is generally higher.

Will destroy the elasticity of the swimsuit,

Usually you can't use it after soaking in hot springs.

So don't wear a swimsuit, or it's a waste!