I'm not sure how relevant the clothes will be for my future creations but I did manage to decorate my current main race quite nicely at various stages.
Here is a Varistii just prior to reaching the tribal stage:

And here is a member of the tribe:

They then changed their look in the civilisation stage and kept it ever since. I was quite pleased with the sort of armoured shell I was able to make out of shoulder pads:

Their backs are also covered by the same armoured plate as their heads, leaving a nice "loin cloth" look hanging down behind the arm. There's plenty of room for creativity, but yes, MORE CLOTHES!
I'd love the ability to colour themseparately to the creatures texture, was irritating that I had to recolour my creature to get the costume looking right.