"They would also put this strap across my chest to flatten any growth that had started, and I don't know, that just felt horrible for six months of the year," said Maisie, according to a report in USA Today.
The actress added the extent to which the makers of the show went in order to hide her developing body and present her as a girl, because the role demanded so, left her feeling "a bit ashamed" of her body.
Maisie was 14 in 2011 when she was originally cast as Arya and she essayed the role till its season eight which concluded the series earlier this year.
Now 22, Maisie said she felt "horrible" and "conscience" about her body image while on the series. "Around season two or three, my body started to mature and I started to become a woman. But Arya was still very much, like, trying to be disguised as a boy said Maisie, on Vogue's 24 Hours With Maisie Williams.
She continued: "I had really short hair and they constantly covered me in dirt and shaded my nose so it looked really broad and I look, like, really manly."
Post GoT, Arya said, she is exploring the feminine side of herself. "With this new phase of my style, it is nice to look more feminine and have a real waistline and just embrace the body that I have," she said.
( With inputs from IANS )