Legal transitioning flag (left) and sartorial transitioning flag (right).
Legal or judicial transition: Changing one's legal gender/sex marker or gendered name. Not everywhere it's changeable, some places require proof of social or medical transition, however, there are self-id laws allowing anyone to change genders in documents, or abolishing gender in documents, except for passports;
Sartorial or vestiary transition: Changing one's clothing gender. This might be seen as cross-dressing or transvesting, however some see this as a form of transition, especially of a trans* person, such as a transvestite or transvestic folk. Not necessarily leading to corporeal or physical changes in one's body, however some use it in addition to accessories and wardrobe, their hairstyle or to change the usual amount of body hair.
These can be contrasted with social transition and medical transition. Not everyone who medically transitions is willing to transition sartorially, not everyone who transitions legally ever transition socially. Everything is possible.
