Crimson is a serif font. It goes well with Open Sans, Helvetica, PT Sans, Roboto, Playfair Display and Benton. If you're thinking about using Crimson then try 160px for headers. Give 16px a shot for content.
People commonly tag it as design, ecommerce, business, education, shopping, history, home decor, classic, insurance and fashion. You can get it from Font Squirrel, Google Web Fonts, Open Font Library and Typekit.