I'm pinning this for inspiration even though there isn't a pattern given for this. Link takes you to ravelry lorijo's fair isle cardigan. She used unknown sweater pattern, fair isle pattern from some mitts, and colors inspired by a painting.
Knitting_Tutorial -- "This article gives several options for holding your yarn when doing Fair Isle or other color knitting. The method shown in the picture is my preferred way and is well worth learning!" ❤️ KnittingGuru ❤️
Free Knitting Pattern for Fair Isle Tissue Box Cover - Great stash buster and quick knit – designer says you can knit in an evening. Chunky yarn. Designed by Clair Thorley. The original pattern provides one chart pictured at the top. The pictured projects are by alterbridge who shares the charts used for those projects.