Help with dating this dress please :)

Hi!

I posted this one on eBay last year, w/no clue on age. Needless to say, it didn't do well, 'cause I still have it!
Any info??

<img src='http://img.villagephotos.com/p/2004-3/674349/Img_3648.jpg' >
<img src='http://img.villagephotos.com/p/2004-3/674349/Img_3647.jpg' >
<img src='http://img.villagephotos.com/p/2004-3/674349/Img_3650.jpg' >
<img src='http://img.villagephotos.com/p/2004-3/674349/Img_3653.jpg' >
<img src='http://img.villagephotos.com/p/2004-3/674349/Img_3651.jpg' >
<img src='http://img.villagephotos.com/p/2004-3/674349/Img_3655.jpg' >

 

late 50's to early 60's Very cute

 

I'm with Adrianne....early 60s or a cusper.

Very nice dress for Spring!

Sue

 

What is a cusper exactly?
The fabric on it is really weird too, very slinky - not something I would have expected from a 50's/60's dress.
Rayon?