Roxy Williams said she received this period-stained ASOS jumpsuit in the mail.

A woman has blasted ASOS after a “brand new” jumpsuit she ordered from the website arrived with menstrual blood stains in the crotch.

Roxy Williams, 36, from Cheltenham, England, shared an image of the grim discovery with her 3,000 thousand Twitter followers.

She wrote: “I know people wash new clothes before they wear them but you shouldn’t HAVE to wash them first, unlike this supposedly ‘brand new’ jumpsuit I bought on ASOS. Yes, this is SOMEONE ELSE’S PERIOD BLOOD. And it’s hand-wash only.”

What’s more, Williams only noticed the bloodstains after she put the jumpsuit on — which she’d bought for $52 reduced from $65 in the sale.

“I didn’t expect to have to check it for bodily fluids first, so I put it on Tuesday morning, with the intention of wearing it to work that day,” she told The Sun.

“It’s backless, so I took it off to put another layer on underneath. It was only when it laid inside-out that I saw the bloodstains.

“For a second I thought I must’ve started my period early (I hadn’t!) but on closer inspection, it was very obviously someone else’s dried period blood.”

Unsurprisingly, Williams was horrified by the discovery and said it made her feel “physically sick.”

After tagging ASOS in the tweet, the brand then responded saying they would look into the matter for her.

However, the shopper says it’s been a “nightmare” trying to contact them as they’ve sent her a “string of automated direct messages with conflicting information.”

In a private Twitter conversation, ASOS’ customer service account reassured Williams that they would give her her money back.

“I have since had an actual call back from someone called Vikki in their customer care team promising me a full refund, a discount on another order and they will cover the costs to have it cleaned,” she said.

“But it was like trying to get blood out of a stone to get any real response from ASOS, pun very much intended…!”