Did my first tri last month, purchased a pair of tri specific shorts and when i got out of the water just pulled on a sleeveless Aldi base layer. If you dont have tri shorts you could just do it in swimming shorts. Good luck by the way!!
My event was an indoor swim so I just bought some try shorts and pulled on a vest type base layer that I got from Aldi's on to complete the run and bike sections.
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Robert Matheson
