Paige Gardner, 23, shared a photo of a dress she had ordered from 'In The Style' for a night out with her friends.
But when she tried it on she realised that she wouldn't be able to wear it in pubic as it didn't cover her chest - at all.
The £24.99 Khaki frock left her breasts poking out through the 'stomach hole'.
The manufacturing operative from Blaina, South Wales said: "I ordered the dress because I thought it was lovely.
I was going to wear it to go to Cardiff for the weekend for a night out with my girlfriends and wanted to wear that.
"My first reaction as soon as I put the dress on was, 'Christ, look at my nipples!'
"It definitely wasn't as fitted as I thought it was going to be."
Despite having a major wardrobe failure, Paige explains that she would still purchase from the website but in future wouldn't compare herself to the models showing off the outfits.
She said: "I'd still order from the website again, but I'd definitely just be more aware of the model in the picture and how much boob they've got themselves!
"Even though it was an embarrassing wardrobe failure, I think it is hilarious.
"My friends who have seen the photo think I'm an absolute legend, but I'm not sure my family would react the same!