Watch seconds 28 to 30, it is a form fitted shirt and a pants. At seconds 29 into 30 you can see that they are pants as she takes a step.
As a side note think about how useless eyewitness testimony really is. We all have the same video, replay, frame by frame and we cannot agree on whether her hands are empty, whether she has a purse, or whether she is wearing pants or a skirt. It is really fascinating to me (not meant in a snarky way at all, just an observation).
Looks like form fitting type pants to me too that are of the shorter type... thought I saw a bit of ankle with one of those last frames in the lobby.
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