Here is a list of useful pattern books for clothing and other accoutrements, should you wish to make your own:
Soldiers' Accoutrements for the British Army 1750-1900, by Pierre Turner
Men's Garments 1830-1900: A guide to pattern cutting and tailoring, by R.I. Davis
The Cut of Men's Clothes 1600 - 1900, by Norah Waugh
The Cut of Women's Clothes 1600-1930, by Norah Waugh
Corsets and Crinolines, by Norah Waugh
Patterns of Fashion 1: Cut and construction of women's clothing 1660-1860, by Janet Arnold
Patterns of Fashion 2: Englishwomen's dresses and their construction 1860-1940, by Janet Arnold
Period Costume for Stage and Screen 1800-1909, by Jean Hunnisett
Period Costume for Stage and Screen: Patterns for Outer Garments, Book 1; Cloaks, Capes, Stoles and Wadded Mantles, by Jean Hunnisett
Period Costume for Stage and Screen: Pattern for Outer Garments, Book 2; Dominoes, Dolmans, Coats, Pelisses, Spencers, Calashes, Hoods, and Bonnets, by Jean Hunnisett
Authentic Victorian Fashion Patterns: A Complete Lady's Wardrobe, by Kristina Harris
Pattern companies for historic clothes:
Lulus.com Sewing patterns and guides (Thank you Katie for the link)