From Discworld MUD Wiki
A <colour> hedge robe.
This is an ancient <colour> robe with small cheap white lace trimmings lining the edges of the garment. It is made out of an old faded <colour> velvet material which looks like it was originally a curtain that has been cut into shape. It is what <colour> hedge wizards would wear. The green <colour> robe has two side pockets. It is in <condition> condition.
Presumably, the colours of the orders of hedge wizardry. Even Octarine...
The <colour> hedge robe is about six feet long and about a foot wide. It is <colour> and is made of velvet and looks like you could wear it. It can hold about 1 pound, or twelve items. It is in <condition> condition.
You heft the <colour> hedge robe and guess that it weighs about a pound and a half.
On the post office balance:
The <colour> hedge robe weighs 1 3/9 lb.