Dragon’s Magic has offered fine linens, wools, and silks at the Pennsic War for over 18 years. Class Act Fabrics has these and more fabrics and costuming supplies at its brick-and-mortar store and website.
Corset stays, also called bones, are available at both Dragon’s Magic and Class Act Fabrics. These stays are white coated, flat steel in ¼” (6mm) and ½” (12.5mm) widths, and are sold by the piece, the dozen or the gross. The ½” (12.5mm) boning is also available in 12 yard (11m) coils for use in hoop skirts.
They also carry Swedish linen embroidery floss and several sizes of English-made glovers' needles and sail-makers' needles.