Rebecca Williams, 21, found the message after purchasing a blue polka dot top from a Swansea store for £10.
The label reads: “Degrading sweatshop conditions”.
Speaking of her discovery to a UK a newspaper, Rebecca said: “I used to shop at Primark a lot but not so much now. The label has made me think about how my clothes are made.”
It comes after Rebecca Gallagher, 25, last week found another label in a garment also purchased from Primark, which read: “Forced to work exhausting hours”.
Both of the girls have now said they will never shop at Primark again. However, it is thought that the second label could raise suspicions on the authenticity of the messages and whether or not it could be the work of campaigners.
A spokesmen for Primark said: “We are investigating the origins of an additional label which has been found in one of our dresses and whether there are issues that need to be looked into.”
Miss Williams says that she previously tried to contact Primark when she discovered the label, and even tweeted them a picture but got no reply.
Do you think the labels are real, or do you think that campaigners are behind them? Let us know via the comments box and at @closeronline.