Very moving adverts!

Years ago, clothing manufacturers placed their name on a label inside the garment. Today, you are more likely to see their name emblazoned across the body of the wearer!
Call me old fashioned, but I object to the idea of my body being used as a walking poster site! Not that I could possibly be considered the ideal image for any trendy clothing designer, but I'm sure you get my point. If I am to advertise my shirt's manufacturer, then I would expect to A: receive the garment free of charge , or B: get paid for my services.
The other problem is that these images invariably draw the eye of the observer to the part of the body across which the message is displayed. This can lead to certain misunderstandings, especially when the offending advertisement is stretched across an ample bosom! Am I supposed to look, or should I avert my gaze?
The other popular advertising area is the back side! The upside is that the casual reader can trot along behind the advertisement with the perfect excuse for studying the advertising site!
Problem is however, that rear end adverts are only effective when posted on to perfect derry Airi! Yesterday I followed a young lady of generous proportions who was featuring the name John Rochas on her bum. John on one cheek, and Rochas on the other. As I followed her I was treated to a kind of flashing display! John - Rhocas - John - Rhocas - John - Rhocas.
What do you make of this strange craze for low cut jeans with high cut underwear? What is that all about? A young man I work with seems to think it's cool to tell the world that Calvin Klein sewed his knickers! Do I need to now this?
And surely, it's not in the designer's interest to have their creations modelled by anything other than the perfect body! And unfortunately this is rarely the case. So why do they do it?
What do they hope to gain?