Source : Webster's Revised Unabridged Dictionary (1913)

Surtout \Sur*tout"\, n. [F., fr. sur over + tout all.]
   A man's coat to be worn over his other garments; an overcoat,
   especially when long, and fitting closely like a body coat.
   --Gay.

Source : WordNet®

surtout
     n : a man's overcoat in the style of a frock coat