"We're...expecting it to be a very promotional period from now on in, starting at Halloween," CEO Nick Beighton told Reuters after ASOS reported annual results.

He also said ASOS was assuming a no deal outcome in Britain's future trading relationship with the European Union.

"If there is a Brexit deal with tariffs we would have to suck up a substantial amount of operating cost," he said.

(Reporting by James Davey; editing by Sarah Young)