Translates to "Anorak and ski pants."
The rather laconic description on the back of the envelope can be translated as:
Front-opening jacket with an applied plastron; gathered hood; ski pants.The jacket is gathered at the waist and wrists. The ski pants have pockets, and the legs are darted and fitted to bands. Woolen or worsted fabrics would have been used for both the anorak and the pants.
I assume that your hankie and the French equivalent of a Chapstick go in the little front pockets of the anorak.
And in case anybody was wondering, we now appear to have documentary evidence that the French wore mittens.