I am 5'6'' (168cm) with a 32C and 25'' waist. Most of my pants are size 24/25 (roughly a size 2). I have seen people complain about size and thickness, and here's my takeaway. 1. The size chart is fairly accurate if you rely on body measurements instead of height and weight. People have different body shapes and fat/muscle mass. For example, while some fashion models need a shirt in US6 because of their wide shoulders, an average person with similar measurements but the shoulder width typically need a size2/4. 2. It is a bit see-through, but it is a BASE LAYER. It keeps you warm without restricting movements when you wear it under something else. I don't understand why people expect it to be like a pair of fashion/fitness leggings. I wear my Lululemon leggings to the gym and Kari Traa under my pants. They both do the job.