Rin Hoshizora is Transgender

Clothing is an important part in Rin's character development (Click to go back)

Restricting Self-Expression via Clothing
As Rin's arc is about coming to terms with her femininity, clothing plays a large role. This progression is most notable, of course, in "Love Wing Bell" (S2-5), but the effects can be noticed throughout the series.

At one point, Rin can be seen attempting to try on a dress she owns, but she gives up and declares that "it just doesn't fit me".