According to the fine print, it does apply to all maternity and nursing apparel, sans intimates. All sale products are non-refundable and non-exchangeable.
Their post states that the sale period for NEX and Vivo outlets is 17 Feb - 13 Mar. JEM and Causeway Point outlets will start the sale from 19 Feb and end on 14 Mar.
I intend to go to the sale in Causeway Point because that's nearest to my place!