I dont think they will have all of the colors for the dyes quite yet, until they introduce the Color ID system. If that system was already finished, then dying it a different color after it has been dyed would not be a problem, but for now, each different stat + different color = multiple items. So instead of

Felt Robe
Felt Robe Green
Felt Robe Red

We have:

Felt Robe
Felt Robe (Magic Potency)
Felt Robe (Mind)

Felt Robe (Green)
Felt Robe (Green) (Magic Potency)
Felt Robe (Green) (Mind)

Felt Robe (Red)
Felt Robe (Red) (Magic Potency)
Felt Robe (Red) (Mind)

etc.
All of these are separate items, which would cause a clutter in memory usage if they continue to do this. Now if they waited until the color ID system to be done, we could make it plain and simple:

Felt Robe (Color ID)
Felt Robe (Magic Potency) (Color ID)
Felt Robe (Mind) (Color ID)

With the Color ID System, less memory would be used since the Felt Robe wouldn't be considered as a separate item for every single color, which was previously announced to be around 32 colors. :O