SSE How do I create a match set bonus?

[stebbinsd]

I'm creating some custom armor in the creation kit. How do I ensure that wearing the full set of armor gives a matching set bonus?

[Evangela]

When all equipped pieces have the same keyword that the perk checks for.

[HeirOfTheSeptims]

You just set up your conditions for your magic effect/perk to check for the keyword you've placed on the armor pieces. You could also use GetEquippedItem to check for specific pieces if you want.