Size zero or size 0 is a women's clothing size in the US catalog sizes system. Size 0 and 00 were invented due to the changing of clothing sizes over time (referred to as vanity sizing or size inflation), which has caused the adoption of lower numbers. For example, a 2011 size 0 is equivalent to a 2001 size 2, and is larger than a 1970 size 6 or 1958 size 8. Modern size 0 clothing, depending on brand and style, fits measurements of chest-stomach-hips from 30-22-32 inches (76-56-81 cm) to 33-25-35 inches (84-64-89 cm). Size 00 can be anywhere from 0.5 to 2 inches (1 to 5 cm) smaller than size 0. Size zero often refers to extremely thin individuals (especially women and adolescent girls), or trends associated with them.
The use of size 0 in advertisements and products of the clothing industry has been met with some media attention. For example, Dawn Porter, a reporter from the UK, who had been challenged to go on an extreme celebrity size zero diet for a BBC programme, Super Slim Me, logged her experiences about her journey to a size zero.
In July 2009, Katie Green won a competition to represent Wonderbra. They referred her to the Premier Model Management agency for representation. Green reported that "one of the guys from the PR agency from Wonderbra" insisted that she lose weight, that it wasn't normal for models to be a (UK) size 8. "Unless I could drop down to that weight, they wouldn't be willing to get me more work." Green, who is 5 ft 10 in (1.78 m) tall  and in May 2011 weighed 145 lb (64 kg), at first complied, but then quit the agency.
She then, with Liberal Democrat MP Lembit Öpik, launched a campaign titled "Say No to Size Zero". They began a petition drive with the goal to put an end to size zero and underweight models on the catwalk or working in the fashion industry. They set a goal to obtain 20,000 signatures and plan to present it to the UK Prime Minister and Parliament. They are campaigning for legislation that would require regular health checkups for all models before undertaking any assignments.
Movement against size zero
After the death of Luisel Ramos from anorexia in August, 2006, Madrid Fashion Week banned size zero models the following month, and the Milan fashion show took the same action shortly afterward, banning models with a body mass index (BMI) of 18 or below. As a result, five models were banned from taking part.
Italian fashion labels Prada, Versace and Armani have agreed to ban size zero models from their catwalks. As of 2007, the British Fashion Council promoted the creation of a task force to establish guidelines for the fashion industry. They also urged fashion designers to use healthy models. An Italian inquiry reported in September 2007 that up to 40 percent of models could have an eating disorder and made a number of suggestions to promote health, yet ruled out a ban on size-zero models. Under the new self-regulation code drawn up in Italy by the government and designers, all models in future shows will be "full bodied, healthy and radiant Mediterranean types". Larger sizes 14 and 16 - would also be introduced into shows and all models under the age of 16 would also be banned.
In September 2010, Victoria Beckham banned size zero models from her New York Fashion Week runway show. Herself a size two (UK size 6) at 36 years old, she reportedly barred 12 models from appearing in her show after deeming them "too skinny". Her fashions will be modelled by "healthy girls who look 'realistic' to encourage a positive image to impressionable teens."
Israel banned underweight models in March 2012. Their law stipulates that women and men hired as models must be certified by a physician as having a body mass index (BMI) of no less than 18.5. The legislation also requires the inclusion of an informational note in adverts using photos manipulated to make models look thinner. There were divergent views on the ban within the Israeli fashion industry. One modelling agent, who had helped promote the bill, suggested that the fall in typical dress sizes for models in the preceding 15–20 years amounted to "the difference between death and life". However, another described the law as "arbitrary" and "not appropriate for every model".
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- "American Apparel Women Shirts Size Chart". Retrieved 16 September 2012.
- Dawn Porter (2007-02-01). "'My quest for size zero'". Daily Mail.
- "They said I was too fat, says Wonderbra sensation Katie Green" (Flash video). News of the World. Retrieved 19 May 2011.
- "Katie Green Official". Retrieved 19 May 2011.
- Goddard, Kay (May 10, 2011). "I may have been the Ultimo bra girl, but one of my breasts was a B-cup and the other was a D". London: The Daily Mail. Retrieved 18 May 2011.
- Rothstein, Simon (16 July 2009). "Katie Green and Lembit Opik team up for campaign". London: thesun.co.uk. Retrieved 7 October 2009.
- Snape, Katie (9 August 2009). "Today's Sunday Live". skynews.com. Retrieved 10 August 2009.
- "Skeletons on the Runway: The "Size-Zero Debate" | Britannica Blog". Britannica.com. Archived from the original on March 4, 2012. Retrieved 2013-03-14.
- "Italian fashion designers ban size zero models from the catwalks". London: Daily Mail Online. December 19, 2006. Retrieved 20 May 2011.
- "Skinny Victoria Beckham bans size zero models in New York Fashion Week show". Daily Mail. London. September 13, 2010. Retrieved 19 May 2011.
- Turner, Sally (Mar 20, 2012). "Israel Passes Law to Ban Underweight Models". Retrieved March 20, 2010.
- "Israel bans use of ultra-skinny models". Reuters. 20 March 2012.
- "Israel passes law banning use of underweight models". BBC News. 20 March 2012.