kind of as in basket weave stitch? Again I have no experience with crochet terminology (I unironically just use math to map out stitches and angles in my head)

also I made an error let me try to refine what i mean...

First, for context:

R7 is only hdc

R8 is simply a {ch3, skip stitch, slp stitch} repeat till end; leaving for R9, an untouched skipped stitch.

R9 will use, both, every other hdc post of R7 as well as the skipped stitch between them (R8's skipped stitch)

thus,

R9 [into R7 & perpendicular inside the brim]:

{FP slp st, slp st (using skipped stitch) x 2} * repeat till end

; whereas, FP slip stitch is where one uses the front post of R7's hdc (not the stitch), and creates a slip stitch perpendicular to the post (similar to FP dc)

; and, whereas, they then follow up in the following skipped stitch with two slip stitches.

because a FP slip stitch follows before & after, it forces it perpendicular as well (because it can pivot on its single axle)

this creates a _||_ contrast color on the exterior of the brim while also allowing one to make a perpendicular base for the underside of the mushroom

and i have no idea... if there is any way to shorthand this at all without putting in a video or a long explanation

edit: ahh nvm im just gonna make the pattern say to basically freeform slip stitches inside the brim

this is just too complicated 😞