The main mall in Patong is
Jungceylon and while it is quite pretty, it really is just another mall with names you will recognise such as Pandora, Crocs, Esprit, Nike, Samsonite, Guess, Oakley and Swarovski but prices are the same if not more than at home. Stop in for a while if you like but don't expect a bargain.
Banana Walk pitches itself as a 'lifestyle mall' but it offers little in the way of shopping. I did however, love the Pimnara Spa with 500 baht facials. The biggest mall on the island of Phuket is
Central Festival about 30 minutes drive from Patong. You will see plenty of names you know and love like Dorothy Perkins, Zara, Guess, La Senza, Lacoste, Levis, Nautica, Next, Bebe, The Body Shop, Miss Selfridge, H&M and Swarovski. Just like Jungceylon, prices will be similar to what you pay at home but if you are lucky you may just find something unique.