Hi Ram, When it comes to wearing tops, they come in many form like backless, halte, tube tops etc. Each of them require a different set of lingerie, and to stock so many of them becomes kinda impossible for the team. If they start wearing the usual bras, the steaps would be visible and the whole texture and look of the outfit would be spoilt. Waise all models use something called a "Nipple Tape" which as the name suggests is used to conver up the nipple. But gosh, the girls sure would be having a tough time changing in 30 secs and looking so awesome. Hate off to em