Brown Shirt refers to the area below the Brown Shirt 1st Chute.
To get there, take the Hikers Paradise ridge all the way to the end of the bowl.
Either ascend up the Brown Shirt 1st or drop in at the very end of Upper Boomerang.
Drop in and when the first chute opens up you have entered the Brown Shirt.
Snow conditions can be variable, be generally this area has good snow.
There are some small cliffs and features to explore.
Likely you will be in the shade of OOB on this run.
Descend and meet up the cat track to the Paradise Chair for seconds or down to the Ptarmigan or Larch Chairs to further explore the backside.
The Ptarmigan also takes you back to the Front Side.