What does Rubashka mean?
What is meant by Chyornaya Rubashka?

Question

Answer

чёрная рубашка -- black shirt

Answer

What is the context of your question?  In English, "Black shirts" refers to a number of paramilitary organizations that have existed in the 20th century, the most famous of these being the SS in Nazi Germany and MVSN in Fascists Italy.

http://en.wikipedia.org/wiki/Blackshirts

I don't know if the same historical association is attached to this phrase in Russian which is why I ask about the context of your question.

Answer

Черная рубашка (Chyornaya Rubashka) or мужская сорочка черного цвета (muzhkaya sorochka) means a sort of man's apparel, it's a black shirt.