You are probably referring to the Royal Worcester Corset Co. I found it mentioned in a book of Worcester pictures called "Images of America-Worcester" by Lois R. Yeulenski. All black and white pictures about the turn of the century. It's probably available at the Library if you are in Worcester, or from the publishers website (
www.arcadiapublishing.com). I think it was $19.95. If you'd like to post your email address, I will scan and send you the two picures that are in the book.
Also in the same book there are references to other ladies undergarment manufacturers in Worcester. One is Lations and the other is Fitzwel Girdle.
Paul Johnson