Kids waterproof trousers with adjustable waist, do they exist?

[dameofdilemma]

Really struggling to find any for my 6 yr old. Tried muddy puddles and Trespass but none have adjustable waist.

Dd is on the short side so am thinking adjustable waist trousers will last her a while as the length will be ok. Also makes it easier to find Ines that fit her length wise!

this!

I thought the OP was having trouble with the waists being too big, not too snug.

Just get a bigger size and roll them up? Or tuck into wellies? Or get cheap ones and cut the bottoms off?