Pink nightgown found next to her body

What would explain why a pink nightgown was found next to her body, when she was found already wearing the white shirt with a silver star on it from the night before? Why would the two outfits be found together?

The nightgown had Patsy’s and Burke’s DNA on it and also stains of JonBenet’s blood on it. Was she changed out of the nightgown and back into the white shirt she was found wearing? Where were her black pants from that outfit the night before found?

What sequence of events make sense for both of these outfits to be found together with her body?