This costume is not exactly comic book or movie accurate, but it is kind of a merging of the two looks. Despite the popularity of Watchmen, it was kind of hard to find good reference images for figuring out the specific colors of some items of clothing. (For example, sometimes Rorschach's pants look black while other times bright purple. It just depends on lighting conditions.)
If you are lucky enough, you might be able to find most of this costume in a thrift store, garage sale, or at Goodwill. This would cut down the cost significantly. I live in a small town in Louisiana, so I did not have a large selection of clothing that fit my needs. Because of this, I had to turn to the Internet for my items.
Also, this costume was made in a rush, so there are a few steps that I forgot to take pictures for.