Grab yourself an "old-school" style flat or modern take of a prefold nappy.
Prefold reusable nappies consist of using a "prefold" flat nappy. A take on the old school flat but with extra layers of absorbency sewn into the middle section of the insert.
These can be folded and fit onto your baby in a range of ways and usually closed using a nappy fastener.
As the prefolds are not waterproof a waterproof cover is required to be worn over it.