[a. F. serviette a towel, table-napkin, of obscure formation, connected with servir SERVE v.1 The older use of the word was exclusively Sc. In the 19th c. it was re-introduced with the French spelling (at first only as a foreign term). It may now be regarded as naturalized, but latterly has come to be considered vulgar.]

I hope this was quick enough for you ;-)

Aren't French terms usually upper class, though?