This is the written pattern for the Highland Raglan Pullover. The pattern is in US terms and includes a video tutorial.

Sizes XS-5X, with positive ease.

You will need to understand how to cable crochet to understand the Celtic weave (but there is the tutorial included).

Uses worsted weight yarn and an H hook.

It comes in different styles: crop or full sweater. And the sleeves can be short sleeve, three-quarter sleeve, or full-length sleeve. There is no seaming!