Note, the images posted are purely for the sake of comparison, and from what I'm able to gather, the photojournalists involved in the gathering of them probably had no ulterior motives...at all...when they were snatc...I mean snapping the photos.
The most interesting of them I think is the one with the red arrows photoshopped in, however, there's a couple of problems with it.
First is the fact that the "see thru" one (the one with the greater "sheerness") is much closer to the camera than the other.
Second is that we're not certain if the pants are, in fact, the lululemon pants in question.
Third is the consideration that neither of the covered surfaces are of the same exact dimensions, and that brings up the "sizing" effect....if excessively small (or excessively large) pants are worn, it will have a different impact on the sheerness observed.
The true test of this situation would be to have one model for the test, with two pairs (or perhaps more) of the product pants in question (before and after the fabric change) with constant lighting, constant camera, (fitted to a tripod) and a consistent "bend at the hip" angle maintained for equal stretch testing, with equal/measured distance from the lens of the camera.
AS OF YET, my research has not turned up a scientifically done study such as this, however, if I'm able to turn up a series of such comparison photos that objectify the discussion and remove the variables so that a clear picture of the full scope of the issue can properly be examined, I will do so.
Until then, I'll be surfing the web on Saturday morning for yoga pant pictures...sound like fun? ;D
NS