Check out episode 23 "The Pharaoh Stones" around the 10:23 mark.
Look at her hands-- several times she pulls at her costume.
Likewise, in Season 3's "Women's War" at the 7:00 minute mark look at her hand behind her, holding the shirt down as she does her mock curtsey.
And there are other examples scattered around the episodes-- its not obvious but if you look at times you notice it. Its subtle-- she tends to put her hand behind her back and there's a little tug.
But anyway, I agree that Patrica Driscoll does look fetching in the outfit!
Hal