You can grub old set you want at khajiit special deal (Patreon)

Hi kotans, Khajiit has a special reward in the store that will allow you to get any 1 set of the previous months or years.  Yes i'ts 95$ tier meow.

This tier includes all this month's rewards and any old set you want.
64 old sets to choose from

Full list of old sets you can find here