How to Make a Tutu — Site with step-by-step instructions on how to make a tutu (both pancake and romantic), basque and bodice. UPDATE: text still appears on the site, but all of the images are missing. According to the website owner's message, her website keeps getting hacked.
Bon-Mar Textiles — Specializes in theatrical costume fabrics, including spandex, sequined, lace, etc. Also sequins, feathers, fringe, rhinestones, and more. (Located in Canada)
Cheeptrims.com — “Quality Wholesale Lace and Trims.” As the name implies, all kinds of trim at great prices. Most items come in large quantities
Cloth 4 Less — Varying selection of fabric, mostly sold by the bolt.
Denver Fabrics — Large selection, including wool, linen, velvet, etc. at good prices. Has a whole dancewear fabric section on their site.
Dharma Trading Co. — Sells silk, cotton and hemp cloth at really good prices. Most fabrics come in white, ready to dye. Sells many different kinds of dyes, too, and the staff give great advice on dying. Located in San Rafael, CA.
Dollar Fabric — Carries all kinds of fabric: silk, wool, cotton, etc. Has a special stage, dance & costume fabric section. Prices aren’t spectacular, but they do carry a large selection, especially of silk.
Fabric Depot — Specializes in stretch fabrics for dance & skating costumes: lycra, spandex, stretch lace, glissenet, powernet, etc.
Fancy Feathers — Feathers and feathered accessories, plus ostrich shells and leather. Business owned by former Ostriches Online employee.
Farthingales — Great Canadian costuming supplier. Several different kinds of coutil, crinoline, net, and muslin; corsetry supplies (busks, boning, lacing grommets, tools, etc); millinery supplies; dress forms; hair canvas; interfacing; ribbon; horsehair; petersham; and more.
Fire Mountain — Wholesale beads and jewelry making supplies. Highly recommended by many costumers.
Lord & Hodge — Grommets and snap fasteners. Sells the big grommet setting machines.
Manhattan Wardrobe Supply — Sells costuming supplies used by film, theater and television professionals. Product line includes adhesives, dyes, fabric protectors, irons, steamers, pressers, jewelry supplies, make-up, millinery supplies, racks, notions, shoe supplies, tags, thread and much more.
MJ Trim — Sells appliques, beads, braid, buttons, cord, fringe, lace, rhinestone, ribbons, tassels, and more.