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James C. Brett makes Marble Chunky yarn in gorgeous colors. The skein is 200 g and an adult hat takes only 1.85 oz.
This hat is made from MC8.
I made this hat by following the directions but using size 8 needles instead of 10. When the hat measured 19 inches along the brim, I stopped and kitchenered the seam. This is the same yarn but a different colorway. An adult hat from this skein had sharp divisions of color but this size sort of blends from one color to another. This color is MC3.
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I've been wanting to try slipstitching with 2 colors and found this pattern. The slipstitching is supposed to extend from the brim to the crown but I stopped early.