Luxury fashion brands Tommy Hilfiger and Calvin Klein Underwear will be moving into the redeveloped retail space, alongside the independent British tailor, Clements & Church.
The Calvin Klein store will be the brand’s first standalone UK presence outside London and Manchester.
Clements & Church, which already has a shop in Birmingham’s business district, will be opening the doors to its second Birmingham store, offering contemporary ready-to-wear, made-to-measure and bespoke gentlemen’s attire.
The three will be joining Harvey Nichols, which opened in its new 45,000 sq ft site in July.
Other shops that will be returning to the Mailbox following its makeover include Hugo Boss, Emporio Armani, LK Bennett, Jaeger and Gieves and Hawkes.
Castle Fine Art will also be opening a new gallery inside.
The Mailbox has announced that its transformed retail mall and skylit “urban room” will now be unveiled in October 2015.
Melanie Taylor, head of leasing at Milligan, development partner and joint owner of the Mailbox, said: “We’re confident that the transformation will be worth the wait!
“There is a huge amount of anticipation about the unveiling of our retail space, especially now that Harvey Nichols Birmingham has opened and set the bar for luxury fashion.
“We’re delighted to announce Tommy Hilfiger, Calvin Klein and Clements & Church as the latest additions to our exciting mix.
“The basket of premium brands which we’re curating for the Mailbox is national, international and local, and will bring a whole new tier of retailing to Birmingham.”
The shopping and entertainment complex has already welcomed a three-screen Everyman Cinema earlier this year, in addition to urban neighbourhood kitchen, Gas Street Social.
To coincide with the announcement of its latest brands, the Mailbox has released a new film highlighting more of what’s to come.