"Tri" anything--tri shorts or tri suit--are meant to be worn in all three parts of the tri. I got a Sugoi trisuit last year, on the recommendation of Susan, the admin from this board, before I knew about the board. You could wear it without a bra, and it was very easy to wear a sturdy sports bra under it, as I'm a 36D.

A word of advice, if it's going to be chilly (in the 50s or low 60s--ie 10 C up to about 16 C)--I suggest you lay out warm tech clothes for the ride. I did, but then made an error in judgement and did not wear them. I was freezing, and the ride was miserable. I had laid out a capilene top with thumb holes, and capilene tights to wear over my trisuit. It didn't "seem" that cold to me, coming out of the pool (it was about 53 degrees), so I just pulled a cotton t-shirt over my dripping wet trisuit and sportsbra. Proceeded to ride probably the fastest 18K of my life, because I was intensely cold. Really miserable. A tech top, long sleeve, over the tri suit would've been enough for running. I always get hot on the run.

Have a great time! I hope you fall in love with triathlon!
Lise