Marjorie Yang Mun-tak, chairwoman of Hong Kong-based Esquel Group.

This explains why textile giants such as Esquel Group and Luthai Group maintain growth — they are big enough to be relied on.

The secrets behind Esquel Group's vigorous performance have a lot do to with its commitment to productivity gains and environmental protection.

"Esquel's annual investment in energy saving and environmental protection amounts to 30 million yuan," said Cheng Peng, general manager of Esquel Group's knitting factory in Guangdong.

In 2012, the shirt manufacturer made a breakthrough in textile wastewater treatment, reusing reclaimed water in the production process.

Because the practices of sustainable development can be found in all production processes within Esquel Group, over the past five years, in terms of producing each shirt, energy consumption has been cut by almost 40 percent and water consumption has been curtailed by 50 percent, according to Cheng.

One of the latest practices that contributes to sustainable development is Esquel's internal information technology development — that includes the mobile application of a self-service salary-checking system.

According to legal requirements, a piece of paper indicating the details of employees' monthly salaries should be put into their hands. Because Esquel has large operations globally, with a total workforce of 55,000 employees, the cost of manpower and paper was huge. An electronic salary sheet was officially put into practice in March, allowing employees to check the details of their salary anytime they want by logging on to the application using their mobile phones.

"It helps save paper resources and brings about convenience and more privacy for employees in checking their salaries," Cheng said.

So far, the application has been developed in three languages — Chinese, English, Vietnamese and the Uygur dialect.

"Some of our green dedication is not so visible now, but it's estimated it will take effect within three to five years," said Yang.

By way of example, she said lids at the sewage treatment facility in Esquel's factory in Gaoming in Guangdong province help to reduce energy consumption and odor emissions during the cleansing process.

In the long run, this considerate move for nearby residents might attract more people to settle in the city, thus bringing in more labor and improving its reputation in the field of environmental awareness, which are considered to be good for the company's reputation.

Another reason for Esquel's rosy performance over the years is what Yang called "our own set of competitive advantages over rivals".

While most rivals in the textile and apparel sector spare no effort in cutting labor costs or transferring factories to countries where labor is cheaper than in China, Yang said she's optimistic about China's coastal regions' attractiveness for the manufacturing business of Esquel Group.

For example, many manufacturing enterprises have moved to Southeast Asian nations such as Bangladesh and Cambodia. However, Yang thinks Guangdong is more competitive than them with regard to the quality of the labor force.

After a fire broke out in a fashion factory in Dhaka, Bangladesh, in November, killing at least 117 people and injuring at least 200, Yang said: "Our orders witnessed a considerable increase".

The accident is believed to be the deadliest factory fire in the nation's history. "Production efficiency is what we value most instead of unit labor cost," she said.

In order to increase productivity, Esquel has shifted its management emphasis from labor input to the cultivation of its labor force.

"When it comes to management, nothing is small business," she said.

Young people such as her daughter usually offer a different perspective in looking at problems.

Yang's daughter Dee Poon, who also graduated from Harvard University and now serves as CEO of PYE, the retail brand of Esquel Group, once studied the relation between the female workers' attendance rates and the rate of unplanned pregnancies.

"Once a female worker gets pregnant unexpectedly, there would be a significant number of days that she would be absent from her position." Yang said. "When such cases happen several times, the factory's total production capacity suffers tremendously, especially in an industry in which the majority of workers are female."

In response to this issue, the company provides training classes on contraception to female employees who have limited knowledge of avoiding unplanned pregnancies.

"It works well and the situation has changed in the interests of the company," Yang said. "Enterprises in the traditional industries have to reform," she added.

When talking about the biggest challenge facing the textile sector, she said: "It's about how to get employees to accept new management thoughts in this era in this industry and to allow staff to give full play to their potential and creativity".

Yang said she likes pointing out her employees' areas for improvement in person "relentlessly" before subsequently offering advice.

The thought of retirement has crossed Marjorie Yang's mind, but she said that she still prefers to work, which brings her much more vitality and fun.

In her leisure time, Yang likes playing table tennis, tai chi chuan (a kind of traditional Chinese shadow boxing) and yoga.

"It is the best of times for entrepreneurs like me because the idea of building the nation by engaging in industry' can finally be realized now, a factor that stems from my maternal grandfather," said Yang.