Yessum! Had your same experience with My Sin. A nice almost-equivalent with a no-nonsense bottle. (BTW I LOVED Casaque too. Do you remember the movie "Casaque D'Or" with the incomparable Jeanne Moureau?)
Think the real Irma Shorell has left us but the company that bears her name does the work.
Have also come to the conclusion that past glories - if discontinued - must be hunted down in flea markets and obscure parfumeries (where on risks decay). Or either (as we say here in the South) be abandoned for present glories! :bounce: