Thank you for the responses. I realized it was a long shot, but I figured I'd try!
I did go back to HD, but all they had was a few Always Afternoon and a few gross of Stella D'Oro. (I *might* be exaggerating, but they had a lot!)
I tried looking through lists of daylilies broken down by category, and found maybe a dozen that matched the picture. Chicago Petticoat was a likely suspect!
Anyway, I was hoping someone was wise in the ways of HD's flower practices.
Thank you all again!