Which waterproof fabric is best?

@[email protected]

I have discovered cloaks, and I am going nuts making them. I have bought so much fabric in the past few days alone. They are so warm and so easy to make! However, I would like to make one that suits the purpose for which they were invented, so that I may wear it outside in the rain. Are there any good waterproof fabrics that won’t fuck up my fiancée’s #sewing machine?

Asking here because I don’t know what I am doing.

@[email protected]