Help! Help! Help! Dear all‑round crocheters, I’m making a hat and plan to have the brim open at the back.

Help! Help! Dear fellow crocheters, I’m working on a hat. I plan to make the brim open at the back, which means I’ll need to crochet it in separate pieces. But I want the patterned effect to match the rest of the hat body—how should I do this? Thank you so much in advance,各位老师们! {}{}{}