An experimental pack dealing with stripes and checkers!
I'll do my best to explain these, they're all over the place.
The stripes:

These stripe brushes work on the dual brush system. For the basic stripes, they're textures at the same angle & size, but one of them is inverted. For the outlines, the stripe texture is on the 2nd (top) brush and the bottom does not have one. You can change the size & angle on both to suit your purposes.

The checkers brushes are made by overlapping 2 sets of stripes perpendicular to each other. Feel free to play with texture mode & density on both brushes. Change the size and angle on both top & bottom brushes!
I have some basic stripe ribbon brushes here too. They look best in monochrome.

(I drew these without stability on, sorry. Turn it on & "Post-correction" too if you'd like.)
Lastly, you get a few weirdos.

The top two are brushes that have the background of a rotating striped ball. Looks quite weird, feel free not to use it. The second two brushes are calligraphic stripe brushes. You can use these to make hair & accessory ribbons too. The last one is just a weird brush you can play around with. Maybe it'll be useful. Feel free to delete stuff if not.
Checkers
Stripes
Ribbons
Weird ones