Shoes

[MacWage]

Smoke and Fire has a pattern for them. Look for ghillies.

[Pleater]

My slick soled motorcycle boots were fitted with soles cut from a motorcycle tyre to give me traction back in the days when we still got snow most winters.

I think that for footwear as light as moccasins you would need to use something much lighter and more flexible or the soles would tear away from the uppers.

How about using offcuts of the stuff used for drysuits, or cutting up a charity shop vinyl shopping bag - I'm thinking waterproof so walking on wet grass will not soak right through.

[eltikiloco]

I think you can buy the type of stuff that they use to sole Birkenstocks, it's a textured plastic of some kind. I can't find the site where I saw it though.