White Linen trousers, loose fiting almost see through with a molicare nappy underneath (purple). They show almost straight through, and if baggy around the waist maybe a little more.
Navy t-shirts - Not as hot as black, but still adds the same effect. Perfect for you goth girlies
Sandals - Keep your toes cool, and show off the paint to those who are looking.
Cut off shorts - Baggy and loose fitting, enough to show the diaper around the waist.
Short pink dresses - What more can I say
In all cases try to avoid satin, its nice and comfy but far too hot. Nice for short periods, but if mummy will let you stick to cotton goodies. And talc in the nappy, keeps nappy rash away and sweat at bay.