Dro'co
I find it amusing that humans claim to abhor something or someone and then decades or centuries later they take pieces or parts and weave it into their life.
While the number of people who have an original Dro'co is low, the number of beings who know of its origin is low enough to be counted on two hands.
Symbolism
Over time many design elements converged on pieces of symbolic importance to the Remnants.
Colours
As Remnants have, according to legend, pieces of the sun and the darkest parts of the night sky woven into their very being, it became an important part of the Dro'co.
Most have contrasting colours of dark blue to purple and light yellow to red. Adding green, the colour of the gods came naturally to most.
Numbers
Many parts of the clothing are in threes, three colours, three types of material, etc. The current belief is that it was supposed to represent the gods, the remnants, and all the other gods creations.
Variants
Every remnant personalized their Dro'co in some way. This was often done with decorations, such as broaches, or by changing the colour or cut.
Those remnant's with shadows of light were very fond of switching the main colours of dark blue-purple and yellow-orange around while keeping the green belt.
History
When the Order of Remnants came to be some argued that all remnants should be wearing clothing visually distinct from the gods other creations. This suggestion did receive pushback and there was never a uniform created. However, that did not stop many Remnants converging on a similar design over time.
Before the Grey War a variation of this costume was worn by most Remnants, but after the war there were only a handful left.
Basic sowing tools, such as needles and thread.
Nice article, I like the colour and number symbolism :D So is it the combination of the specific cut in your image and those colours that are specific to the dro'co? I'm just a bit confused because you say "Every remnant personalized their Dro'co in some way. This was often done with decorations, such as broaches, or by changing the colour or cut." so I wasn't sure :p
The image represents a late version of the Dro'co without any personalizations with a typical cut and colours.