What a great question.
I'd love to see Houbigant's Essence Rare re-released in its original form, or at least in its '70s form.
Would also like to see Lanvin restore Arpege to its original glory.
AND, it would be wonderful if Caron would restore some of its urn greats, like En Avion, French Cancan, etc.
Well, a girl can dream, can't she?