Although covered up, I also do still like to be cool, so I chose This lovely soft, cotton jersey of medium weight from Croft Mill. They have some wonderful fabrics and of nice quality and their service is faultless. The only down side is that the P&P is pricey. It helps if you buy more than one fabric to compensate for this should your funds allow!
One thing to be aware of if making this pattern; check the finished garment measurements before cutting. There is a huge amount of ease in this. So much so, I cut a Size 4!