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Lillie Cattell, 18, had been working as an administrative assistant at a property management company in Harlow for the past 11 months when she says she was called for a chat by HR.
A HR employee at the company then told her what she was wearing was "inappropriate" before sending her home to change.
"I had frustration and anger building up inside me because I had warn the same outfit a number of times before," she told Essex Live.
"I just said ok and walked off. I was having a panic attack, I couldn't breathe."
Lillie - who was dressed in a yellow roll neck jumper, checked shirt and black boots - claims it's an outfit she's worn many times before.
"I was full of embarrassment I had to log off and get my bags and explain to my manager why I was leaving," she told the news outlet.
"When I got in my car I was having a panic attack, I couldn't breathe. On my way home I had to pull over on the A414 because I was hysterically crying, my dad came to pick me up.
"I just feel humiliated, my dad told me I should put in a formal complaint, so I did. There was no sympathy or anything, I have had no contact with my manager or director."
Lillie added: "I am on a low wage anyway and they expected me to make a 40-minute journey home to change, that is petrol I would have had to pay for.
"I want to do well and take every opportunity that is given to me but I feel like I can't. I just feel like I can't win."
The teen, from Hoddesdon, Hertfordshire, says she was offered to attend an informal meeting to discuss the incident but declined. Lillie has since left the company.
I think we can all appreciate hard this would be to take at 18. Good on you for leaving, Lillie!
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