I love the costumes of the Regency Era. I have made several Regency outfits in the past and greatly enjoyed wearing them.
Stays are the foundation for the dresses of this Era. The pair I had was looking pretty bad so I made a new set back over Thanksgiving weekend.
I used Sense and Sensibility's Regency Underthings Pattern. They are made in three layers: two of cotton twill and one of cotton twill interfaced with heavy weight interfacing. They are quilted on both sides, boned with plastic boning from Hancock Fabrics, finished with bias tape and laced with twill tape. I *a-hem!* took the quick way out used metal eyelets rather than doing hand sewn eyelets which is what my last pair had.
For more information on the clothing of the Regency Era you can visit Jessamyn's Regency Costume Companion. For pictures of real Regency garments see Sense and Sensibility or Tidens Toj. For Regency costumes in movies go to Jane Austen Movie Gowns, Eras of Elegance or The Costumer's Guide to Movie Costumes.