Pyjama top by Oasis, You're invited to this PJ party, Adjustable cami straps, All-over star print, Regular fit, True to size. Opening its first store in 1991, Oasis has gone on to become one of Britains most popular high-street brands. Expect vibrant prints and plenty of colour across a collection of dresses, tops and tailoring, plus bags and shoes for all your accessory needs the add-to-bag potential is real.