We can think of 'dansou' as the word 'crossdressing' (women crossdressing as men). Dansou gyaruo is traditionally a woman dressing as gyaruo. So you don't identify as 'dansou gyaruo' exactly, it's a descriptor like kogal. You "do" dansou. I'll write much more on the topic later because there's a lot outside of gyaruo but it's interesting! You can mostly find women doing dansou in Harajuku style like model Akira in KERA Boku magazine (and there's another called Garcon Girl), but Men's Spider also has dansou gyaruo. The most known dansou gyaruo must be Ruuto.