You can find vest crochet patterns for various skill levels, including beginners, on sites such as CrochetPatternCentral.com, CrochetPatternsGalore.com, LionBrand.com and RedHeart.com, as of 2015. Most patterns include details about the difficulty of the pattern, as well as a sample picture of what the vest looks like upon completion.
Many of the patterns on CrochetPatternCentral.com are available as a free PDF download, though some do require the user to sign up for a free account with the site. CrochetPatternsGalore.com allows users to search according to aspects of the project, such as vest size or yarn weight. LionBrand.com includes a skill level with all of its patterns, with an accompanying summation of the difficulty of the project. RedLion.com features a similar rating system for its vest patterns as well.