You didn't read the article and directly went to blaming women for being fat and vain when it's always been about maximizing profits at the expense of women's comfort.
The same phenomenon exists in the bra industry, where women are binned into a narrow distribution of ill-fitting sizes. Bras are a medical necessity for many women and poorly fitted ones often contribute to back pain, sores, inflammation, aggravates HS, and more. Yet scummy companies like Victoria's secret have pushed as many customers into 36C as they can to cut manuf costs.