Judy Cox, from Utah, was shopping with her 18-year-old son when she spotted T-shirts featuring skimpily dressed girls on the front.
She then took it upon herself to complain to the store manager, before being told that the store could not remove the T-shirts from the window without approval from their head office.
Outraged, Judy bought all 19 T shirts for $600 dollars in total.
'These shirts clearly cross a boundary that is continually being pushed on our children in images on the Internet, television and when our families shop in the mall,' Cox said.
'You don't have to buy $600 worth of t-shirts, but you can express your concerns to businesses and corporations who promote the display of pornography to children.'
The store PacSun, that sells beach style clothing for teenagers, has released a statement saying: 'While customer feedback is important to us, we remain committed to the selection of brands and apparel available in our stores.'
'These shirts clearly cross a boundary that is continually being pushed on our children'
However an employee at the store told Rob Kallas, the mall manager, that she was embarrassed to put the T-shirts on display but was just following instructions.
The incident occurred in the town of Orem, Utah, where most residents belong to The Church of Jesus Christ of latter-day Saints - which looks down upon pornography and baring too much flesh.
City attorneys have previously asked Victoria's Secret, a lingerie store in the same mall, to remove pictures they deemed inappropriate.
Do you think that advertisements and shop window fronts are becoming too sexualised? Do you worry about the effect it has on young people? Or do you think this is an over-reaction?