A Twitter backlash was sparked yesterday when a size 8-10 woman was apparently told she wasn’t “skinny enough” for a dress in a fashionable Hampstead store.

The customer is always right, or so the retail mantra goes - except when they’re not thin enough to wear your clothes, allegedly.

Vivi Kenny, 24, tweeted her discontent with French clothing store, The Kooples, yesterday after she claimed she was advised against a dress by a male assistant.

Ms Kenny tweeted: “I was just @The Kooples in Hampstead when the guy there told me I wasn’t ‘rock chick skinny enough’ (for a dress) ‘like the French girls’.”

Her tweet was retweeted by her sister, actress Emer Kenny, who used to play Zsa Zsa Carter in EastEnders, sparking a storm in a Twitter cup against the upmarket brand for its alleged body fascism.

One woman, Lorna Booth, tweeted: “Size 8/10 not skinny enough. What a hideous thing to say to a customer.”

Another tweeter, using the handle @Zezzed, took issue with the store on different grounds, writing: “I have no problem with the guy giving advice. I just don’t think the quality of the clothing is worth the money.”

The Kooples, who have stores all over the world, then apologised to Ms Kenny on Twitter, and asked her to contact them directly with her concerns.

Ms Kenny’s original tweet was later deleted, but not before TV presenter Jameela Jamil had shared her thoughts on the matter, tweeting that the assistant’s alleged comments were “totally unacceptable”.

The Ham&High has contacted the store in Hampstead High Steet and The Kooples’ press department for comment.