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Talking about underwear can be uncomfortable with people you know.

Talking about underwear with a complete stranger is downright awkward.

But one mum is wondering whether she should suck it up and have the embarrassing chat.

The mum, who goes by the username ClinicallySilly, posted in a popular online discussion forum, seeking advice on social conduct.

"I see a mum on the school run every morning wearing very see-through leggings.

"Today, she bent down in front of me to get something out of the pram basket and I was greeted by a view of her arse through her leggings.

(Image: Getty)

"She had a pink thong on under thin black leggings and a top which stopped at her hips. So everything was visible, I felt embarrassed on her behalf," the woman wrote on Mumsnet .

She then asked, if she were to see her again, should she 'diplomatically' tell her that everything was on show.

She added: "I'd want to know I think. It's hard to see how see-through a fabric is until you wear it and you wont always be aware that your backside is on view."

Many users were in agreement and said they would want to know if it were them.

One mum said: "I've seen this sort of thing so often and always wonder if the wearer is aware of it. I suspect not. Tell her if you're brave enough."

(Image: Mumsnet)

Another wrote: "I would tell her. She might not know, I emailed someone from another department at work I could see their knickers.

"She didn't reply but she spent the rest of the day with a jacket around her waist and never wore those trousers again so clearly she didn't realise."

A third commented: "I'd just tell her, people are so weird with this type of stuff."

(Image: Getty)

However some people thought the woman might already know and it was better to leave it unsaid.

"She knows. It's deliberate. She thinks it's sexy. Maybe it is, who knows," posted one user.

"I think that people must do this on purpose. When I wear leggings and low rise trousers, I always bend over in the mirror to see if my thong/knickers are visible," said another.