The reason most of those images of underwear didn't look like their logo is because most of those pants (as us Brits refer to them as) were not proper Y-fronts.
If you look at this image - bar the colour / pattern of the underwear, it's actually geometrically similar (which the briefs they exampled were not)
If you look at this image - bar the colour / pattern of the underwear, it's actually geometrically similar (which the briefs they exampled were not)
http://img.thesun.co.uk/aidemitlum/archive/00418/SNF14WOM01C...