BUR #22164 has been approved by @evazion.
deprecate lavender_background
deprecate lavender_dress
deprecate lavender_headwear
deprecate lavender_sailor_collar
deprecate lavender_panties
deprecate lavender_shorts
deprecate lavender_footwear
deprecate lavender_skirt
deprecate lavender_shirt
At first lavender means lighter shade of purple. However, I think there's no way all of them can be aliased into purple_* because these ambiguous "in-between" shade of coloured attire tags do not comply to the site's standards anymore.
For instance, post #3567005 was tagged lavender_jacket while the shade of its fabric looks more like white (light grey?). Also, for the lavender_skirt on post #3531345 looks more like pink. Even worse, it was also applied on post #3523649 which obviously depict deeper shade of purple.
Similar action has been done upon light purple hair (forum #255866), as well as beige_* tags (topic #20900).
Updated