It is the first time the RNZB has commissioned a fashion designer to design a product specifically for the company.
Ms Cooper, who is known for her silk embroidered accessories, said she was "extremely honoured and delighted" to have been approached by the RNZB.
She was first contacted by the company about the deal at the end of last year, although she had sold her main line of products through the company before.
The range of 17 specialty products will go on sale in the next few days both online and in retail stores.
The range includes brooches, hair-ties, compact mirrors, necklaces and clutch bags, all of which will be hand-embroidered with small pink ballet pumps.
The deal is a sponsorship arrangement in that Ms Cooper will design and manufacture the items and a percentage of the sale will go to the RNZB.
Ms Cooper said the deal would give her a fantastic audience with both balletgoers and young ballet dancers and, in turn, the ballet company would get exposure where it would not normally, in fashion design stores.
"As many young girls do, I learnt to dance and dreamed vividly of becoming a ballerina. This exciting design collaboration has allowed me to realise part of this dream."
RNZB general manager Amanda Skoog said she had been thinking for some time about how the company could benefit from new partnerships.
"Tamsin is the perfect fit - elegant but fun - offering New Zealand-designed product of the highest quality.
"We are very excited with this new collaboration and feel it is unique."
Ms Cooper said the deal meant a new revenue stream for her company in what is a difficult time for all businesses.
