I always heard shorts, not pants. But, her missing poster says pants.
Here is a thought, could SW change her own clothes? I mean, at home. Because she was at home and briefly alone before she disappeared.
While I don't necessarily think she changed clothes again... She might have if that was something she could do.
ETA: i just wonder if some basic information we have is wrong. If SW, for some reason, changed clothes. However, in that small house, i guess they would have figured that out by now.
The average 5yr old can change remove and put on clothing, though perhaps not always right-side out. There’s a tremendous variation in those kind of fine motor skills at 5, but the average child can do it.
Someone (the 15yr old maybe?) said CBW assisted Summer with her bathing suit at the 15yr old’s home. But that’s a bathing suit - the tight fit and straps can be frustrating for some 5yr olds.
By now, I imagine we’d know if the special outfit was left behind. But we still don’t know anything about her shoes, to my recollection. JMO.