Simply put, this is how a person appears. How a person manifests their gender identity through clothing, hairstyle, voice, body shape, makeup and so on – be it masculine or feminine. Many transgender people try to make their gender expression match their gender identity, so the outside matches the inside, rather than match the sex assigned at birth.
Gender expression” refers to the ways in which we each manifest masculinity or femininity. It is usually an extension of our “gender identity,” our innate sense of being male or female. Each of us expresses a particular gender every day – by the way we style our hair, select our clothing, or even the way we stand.
This is also referred to as “gender presentation” which is defined as:
Gender presentation or gender expression is one’s outwards appearance, body language, and general behaviour as categorised under the gender binary by society. Common descriptors of gender expression are female, femme, feminine, twink effeminate, androgynous, male, masculine, macho, butch, and so on.