As long as whatever you wear will shed water well, you can wear it under your wetsuit. Usually that's a sports bra or tri top (more like bathing suit material and close fitting to the skin) on top and tri shorts on bottom. Then, when you get to T1, you can add a jersey or whatever you might need. When it's warm enough outside, the tri top and tri shorts alone work, but if it's chilly adding another shirt is nice.
If your singlet is next to the skin type fit, it might be okay. If you get your wetsuit soon enough you can do a practice swim and try anything you might think of wearing.



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