Red is a fascinating color because it has a huge range; from pink-reds to true red to berry, this is one of the most important colors to describe by name in your online listings, so your buyer will know if the gown they are buying is burgundy-red, true red or a light shade of red, because they want to make sure it matches the shoes they already purchased. 

The color Red also encompasses Pink because Red, Yellow and Blue are Primary Colors and Pink / Magneta, Purple, Brown, Yellow, etc are Secondary Colors that are made using Primary Colors  :)

Here's a great, simple Cheat Sheet that features the most popular shades of red (you can click on the image to enlarge it):