A site’s webmaster provides a personal collection of links addressing costuming. The links include references, history, theatrical organizations, events, schools, and instructions.
Really, if there’s an aspect of costuming you’re looking for, you’ll find it here: almost a costuming wiki.
A starting point for dramaturgical research from the University of Puget Sound. Addresses research and information on how to find dramaturgy materials. The University’s library provides further resources: http://library.ups.edu/instruct/ricig/productionresearch/ (Nothing really says rain and Douglas firs the way dramaturgy does.)
Founded in 1985, a professional organization serving members throughout North America and abroad, seeking to: “affirm, support, and broaden the roles that literary managers and dramaturgs play in the theater.” (They are also people who will proofread and fact-check every entry on this website. For fun.) The site provides links to: Dramaturgy Blogs and Social Media; the LMDA Twitter Project; the LMDA Dramaturgy Discussion List; Employment Guidelines; a Handbook for Dramaturgy Students; Internships: Report & Guidelines, and more.
A resource guide on lighting, scenery, costuming, and sound. Links include: general, mailing lists, web rings, and newsgroups, search engines and web indexes, books and bookstores, sets/scenery, props, costumes and make-up, sound, and lighting.
Louis E. Catron’s site provides information on resumes, headshots, websites for actors, books, job listings, and much more. Kind of a “how to” for student actors and others.
The site sells materials for special effects, but it also serves up a veritable how-to for stage magic, from fake teeth to UV effects. It also offers a nice set of links, including job listings.