I haven't done plaid in a long awhile. I did this mani with a striping brush and a few purple favorites. I always plan my plaid on a paper plate (PPPP for short!). That way I know the order to paint the lines for that woven over/under look. What I like about it is the texture. The stripes are raised but smooth.
I started with a base of Zoya Kendal. The stripes are Sally Hansen White On, China Glaze Coconut Kiss and Zoya Lotus.