The phrase "cent cotton" means something that is of very low quality or value because it indicates that the material is made from very cheap cotton that costs only one cent. Full definition
According to Shafik, males in the 18 - month study wearing only 100 per cent polyester underpants showed a significant decrease in the proportion of potent to impotent «behavioural responses», compared to those wearing 100 per cent cotton underpants. (newscientist.com)