I've always wanted to created a half-circle(-ish) shawl in brioche, but it took me a while to think of a pattern with the appropriate number of increases. This shawl is started with only a few stitches at the top center and knitted (and increased) outward. That way the size is easily adaptable - and the pattern can also be used for a different yarn weight.
If you want to knit this pattern you should know how to knit flat two-colour brioche.
The pattern PDF contains
\- row-by-row pattern instructions
\- photo tutorials for the brioche increases and decreases you need for this piece: brk2inc – a brioche increase, brkX – brioche stitch that creates the lattice effect