|I've always been a big fan of the tip for Using WhiteOut to Mark Polar Fleece. But the WhiteOut gets gunked up easily with fibres, and it dries out quickly once the fibres get in the bottle. So when cutting a sweater knit earlier today, I had an Aha! moment. Cut small notches out of masking tape and use those to mark the knit. I keep the notches small enough that they don't cross the seamline. It's precise, it stays, and it comes off easily. You can also use painter's tape, which is even easier to remove.