Here in Manhattan, almost no one has an outside. I must be wrong but from the few times I’ve visited Japan, vast swathes of Tokyo is the same.
https://sc01.alicdn.com/kf/HTB1JbgNSFXXXXX6apXXq6xXFXXXU/202...
Sure clothes create dust, but the majority is created because during regular wearing and/or packing. (The dryer tumbles the clothes, whereas indoors it barely moves.)