Yale drinks

[Douglas G. Wilson]

>... most if not all of us can't even get our hands on a good
>bottle of Creme de Yvette.  Or on why it isn't spelled Creme
>d'Yvette, whatever it is.

It seems to be a trade name for creme de violette or something very similar:

http://hotwired.lycos.com/cocktail/archive/links/nc_creme_de_violette.html

Possibly it is not produced any more. There are other similar products; e.g.,

http://www.benoit-serres.com/pages/right3.html

-- Doug Wilson