High-end fashion group Costarella Design has acquired the SU apparel brand in Australia.

The ASX-listed company said that acquiring SU gives it a new and high-margin revenue stream, as well as a route to global expansion.

Costarella has purchased the brand through a share transaction, offering 1m of its shares for a 100% share in SU.

The SU brand was launched in 1999 by designers Sonia Audino and Silvana Mancini, and is now stocked by boutiques in Australia, Singapore and the US.

"The acquisition of SU is an exciting step for Costarella Design Limited," said managing director Aurelio Costarella.

"Sonia and Silvana's design aesthetic, unique detailing and op-pop style has great appeal in the international marketplace and in particular the US, China and Japan.

"There is a strong synergy between the design and business philosophies of the two brands."