Her post was followed by a flood of similarly-harsh criticism of the campaign under the hashtag "I am enough".
Elinor Snowsill, who plays first five eighth for Wales and Bristol, posted photos modelling the new Bristol Bears kit, provided by Umbro, alongside players including the English Premiership's new golden boy Semi Radradra.
"Sponsors, clubs and unions take note," Snowsill wrote. "This is what a kit launch should look like. It's really not hard. We have had enough of sexist double standards in sport."
The online outcry immediately prompted a response from the clothing brand which entered into a dialogue with Williams and pledged to photograph male and female rugby players together in all future kit launches.
The brand also told the UK's Daily Telegraph it would unveil a women's jersey to coincide with the men's British and Irish Lions tour next year, while issuing an apology for "getting it wrong."
Canterbury of New Zealand was founded in Aotearoa in 1904 and was a longtime manufacturer of the official All Blacks jersey. The company is now owned by global entity Pentland Group but its head office is located in Avondale, Auckland.
