Template:Dyeable items

染料 only affect tagged portions of dyeable armor or cosmetic items.

• The dyeability of costumes depends on the specific costume.

Outside of wanting to keep maybe some identity from a lore perspective; for example if you have like a white lion's suit of armor, you may not want that white lion suit of armor to be black or blue. So, it's possible. It depends on the costume itself. – Steven Sharif