Labelinfo.be offers a useful overview of sustainability labels. You can select lifestyle and clothing to limit the scope to those labels that are relevant to the fashion industry.
Each label is accompanied by its logo, a short description and a score based on three criteria: environment, social circumstances and assessment (reliability).
Labelinfo, an initiative of Netwerk Bewust Verbruiken (conscious consumer network), is a survival guide in times of label confusion.
Finally, the website of Dutch Sustainable Fashion Week is also worth checking out: it divides labels into several categories and adds some extra information.