I believe the brown actually replaces the vanilla monk robes though. The 'Mages of Winterhold - Common Robes Pack - Version 2point5' is supposed to add 4 new monk robe variants.

IF I use it, I usually add this one to the blocklist because I can't figure out how to stop the redundant names without manually editing every single robe, boot, and hood name in TES5edit. There are also hoods and boots with similar names. The robes are named 'Apprentice Destruction Robes' and such (because each school has its own color scheme) so when PaMa grabs them and assigns an enchant to them, they look like this, 'Apprentice Destruction Robes of Destruction'.

The 'Mages of Winterhold - Standalone Pack - v3point6' only adds the robes as unenchanted new robes and leaves the vanilla ones alone. Hopefully this will help you know what kind of support they each need. Unfortunately the mod author posted a notice back in February 2014 that they are no longer able to work on this mod. I noticed this on the todo list and I use it.

Mage replacer pack.esp missing