I do appreciate the Tiers added to the wardrobe, but I forget very easily which is which. I so far have had them listed in my journal and then keep a second tab open. I know many probably are very familiar with the markings, but as I am designing a new lion I sometimes need a reminder.

So maybe put the list under the wardrobe? Or an additional little pull down on the bar/tab?

Tier 0 - common markings, such as ones found in NCLs, rolled males and Oasis
Tier 1 - custom markings, such as ones found in Marking Applicator and Oasis
Tier 2 - raffle markings - these are breed only
Tier 3 - event markings - these are obtainable via special events such as monthly NCLs, event applicators, NCL exclusive etc
Tier 4 - rosette markings - these have unique breeding patterns
Tier 5 - these are disabled from Random Marking Applicator due to unique raffle applicators, event applicators that aren't unlocked yet, mutation markings and so on.
Tier 6 - these are RMA exclusive