To demonstrate the outrageous sizing, Ally then put on her size 8 New Look slim-fit jeans, which fit her perfectly.
Fellow TikTok users were quick to praise Ally for highlighting the shocking sizing differences between clothing brands, with many saying they themselves had experienced the same thing.
One person commented: “Glad I’m not the only one this has happened to! I’m normally a size 8/10 in jeans and I have to get a size 14 from Primark last week.”
Another wrote: “Primark ave always had dodgy sizes, I get so disheartened there, I’m only a 10-12 & what is with their changing room mirrors, they show everything.”
A Primark spokesperson has since addressed the video, saying: “The fit of our clothing is really important to us and we are always working with both our suppliers and technologists in our quality team to ensure consistency.
“We continue to fit our designs using Size UK data as standard but always encourage customers to get in touch with us if they have concerns about sizing and we will happily look into their query.”