Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993.
décolletage (n.), décolleté (adj.)
These borrowed French terms retain their acute accent marks in written English, and they are pronounced in something approximating the French sounds: dai-kuhl-(uh)-TAHZH and dai-kuhl-(uh)-TAI. Both refer to a style of womans dress displaying a good deal of bare neck, bosom, and shoulders.