I think it might have started yesterday. Peter Alexander is currently having 20% off Store Wide (exclude non-PA branded items, charity items, Glasshouse products & gift cards). Ends midnight Sunday 14 December. Terms and conditions:
Offer available online and in Peter Alexander stores in Australia and New Zealand (excludes DFO stores), plus selected Myer Women's Stores. Excludes non PA branded items, Charity items, Glasshouse Product, Gift Cards and Lay-By. Discount applied at checkout, not to be used in conjunction with any other offer. Starts online 4pm Wednesday 10 December 2014 AEDST and in store Thursday 11 December 2014. Ends midnight Sunday 14 December 2014 AEDST on peteralexander.com.au and midnight Sunday 14 December 2014 NZST on peteralexander.co.nz
There's also free delivery on orders $100 or more.
Do note that Peter Alexander is part of the Just Group, which is part of Premier Investments, which Solomon Lew is chairman of, whom recently have threatened to exploit the GST-free loophole. So buying online at Peter Alexander might get your clothes grey-imported from overseas.