Vintage Nightgown and Robe

This robe and nightgown were in with some clothing that I acquired at an estate sale.  The tag reads "Corona UND. Co."  I'm assuming it is the Corona Undergarment Company.  I've searched to no avail in regards to this company.  If anyone has any insight or information regarding this, I'd sure love to hear! 

They are both in good condition as far as no holes, or rips.  There is discoloration and stains.  I'm chalking that up to age!

Please take a look and let me know!  Thanks!

Poor