Posted: 04/11/2013 at 14:52
This is why tri suits were invented, have a look round more mile do them pretty cheaply and Aldi sell their own at certain times of the year.
You could wear your sports bra under your cossie and chuck pair of shorts on in transition although you might be better to go for baggie ones as you need to be quick in transition and clingy clothes are a nightmare to put on over wet skin.
Some tri tops/tri suits have inbuilt bras which I find OK for me but others want more support, if so look for a sports bra that won't soak up loads of water in the pool. This is where man made fibres tend to win out over cotton.
This might help http://www.pirateshipoffools.co.uk/?p=467