Poppy is seen with a bareback putting on a tank-top for sleep. When she is awakened by the disturbance and runs outside to look at the victim, she's wearing a bra.
When Carrie is going to bed, she is shown pulling on a maroon shirt and is not wearing a bra. She is awakened by the disturbance and goes directly outside without changing and checks the body. In the flashback scene when she is over the body, you can see she's wearing a black bra under the same maroon shirt.
March 27, 1998 in NYC, sunrise was at 5:47 and not as Carrie says at 5:46.