The two will report to the group chief executive Mark Goddard.
Pokaia, who worked for Glassons for 13 years before moving to work as Cotton On's brand manager in 2016, will take up the role from Dec. 1, while Glasson, the general manager of Glassons Australia, will take up the role immediately.
In the last financial year, Glassons sales in New Zealand rose 7.2 per cent to $89.5 million while Australian sales gained 22 per cent to $50 million.
It has plans to open two new stores in Australia including one in Melbourne's CBD in the current year. Online sales grew 44 per cent in the year, much faster than brick and mortar stores, and now account for 9 per cent of total turnover.
The shares last traded at $3.34, and have gained 9.5 per cent this year.