What do these dresses have in common?

So this gal wanted to make something special. She'd been looking for exactly the right thing. She had this clipping of a slim skirted sleeveless dress. But look at that back neckline...wow! It's a show-stopper. (This dress is by Jeannette Alexander.)

Then she had this much more sedate simple sheath with a boxy jacket. More like an office look?

So what did she find? This amazing Simplicity Pattern 2370. It has that sexy low back and the boxy little jacket...plus a terrific overskirt to change out the look. She did well!
(both clippings were found inside the pattern envelope.)

As a side note, the pattern is stamped "Parsons Dept. Store" and the address is across the street from my favorite coffee shop, but nobody remembers a department store ever being there, and I couldn't find out anything online. I'd love to know more.