In the original Resident Evil, Rebecca is seen wearing her S.T.A.R.S. uniform, a green T-shirt and pants with a white bulletproof vest. The red cross symbol is printed on the back of her vest to indicate that she is a medic. She also wears green, fingerless gloves and boots. She also wore a red headband, pink choker, and white earrings, the first of which has been omitted in all of her subsequent appearances.
In the Arranged Mode featured in Resident Evil: Director's Cut, she wore a streamlined, burgundy-colored version of her uniform, which consisted of shorts and a T-shirt. In the Resident Evil remake, her alternate costume is a cowgirl outfit consisting of a brown cowboy vest, boots and jeans shorts. This costume was carried over to Resident Evil Zero along with another alternate costume consisting of leather pants and a halter top with long fingerless gloves. In Resident Evil: Deadly Silence, she had an alternate costume of a cheerleader uniform.
In her latest appearance in the upcoming movie, Resident Evil: Vendetta, Her brown hair is now in a shorter bob with a full fringe. Rebecca wears the same outfit as in the first Resident Evil but updated; her green short sleeved shirt is darker and now appears as a long-v-neck with a red sleeveless undershirt and her pants are now blue. She also retains her white bulletproof vest and no longer have the red cross symbols printed on the back which she became a B.S.A.A. operative, her fingerless gloves are now brown and her choker is red.
When she was kidnapped by Glenn Arias and his henchmen, she was seen wearing a white long sleeved dress.