Emily Charlton-Smith, from London, was mortified after she suffered a major wardrobe malfunction on holiday.
The 25-year-old purchased the £17 bikini from online retailer, PrettyLittleThing.
But when she wore it to the pool while on holiday in Spain, Emily was left scrambling for cover when it turned see-through in the water.
Taking to Instagram, she went to complain about the item, before being asked to take a video of the garment’s transparency.
Screenshots of the conversation show an advisor, Nowman, asking Emily for proof of the incident.
The message read: “Can you send us video of this so we can see how thin it has become?”
She responded with: “As in a video of it going see-through when I wear it?”
An hour later, Nowman disappeared from the conversation and a different customer adviser issued an apology.
“I’ll save you the nude porno video”
The PrettyLittleThing adviser said: “I’m so sorry, that was advised wrong, can you send us a photo of your hand under the bikini to show how see-through it is.”
Images accompanying the post show Emily’s white bikini turning translucent after being held under water.
In response to her complaints, a PLT customer services adviser said: “From the material it can be expected to happen, most of our bikinis we do advise for them to be worn for poolside posing based on this.”
Emily shared the exchange to her Instagram followers, with the caption: “I’m not sure what’s worse @PrettyLittleThing’s Nowman asking me for a video in my see-through bikini or the customer service team telling me bikinis are for poolside posing only.
“I’ll save you the nude porno video (soz Nowman) but this is what we’re working with.”
Speaking out after the whole blunder, Emily added: “You have to laugh that they asked for a video initially, I think that would have sent most people over the edge, but I let it play out as I’ve worked in retail and try to be helpful.
“The best and most mortifying part is that they said bikinis are for ‘poolside posing’.
“I posted it on my Instagram story and have had so many people express their frustrations for me and some have had similar experiences.”