Terminology Confusion
As previously stated, "ACU" stands for "Army Combat Uniform"; while most people have incorrectly used the term as a reference to the US Army's digital pattern, it is in fact a reference to the CUT (design pattern) of the uniform.
In the same manner, "BDU" also came to be a reference to "military fatigues" (in the king's proper English) or "field uniforms" or "utilities" (in military parlance) the same way "Sea-Doo" -- a Trademarked model name by Bombardier -- came into general use to refer to "personal water craft." The term BDU (Battle Dress Uniform) refers to the well known cut of US military field uniforms.
Similarly, the proper terminology for the USMC field uniform is MCCUU (Marine Corps Combat Utility Uniform).
The most distinctive features of the ACU cut are the mandarin collar, slanted chest pockets and sleeve pockets.
Multicam, civilian versions of MarPat, and Digital Urban have all been made in the ACU cut.
The proper term for the US Army digital pattern is UCP (Universal Camo Pattern).
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