Tri shorts and a tri top will be fitted enough to not affect aero. Whatever drag you'd get is miniscule and not likely to affect your bike time.

Cue bmanners to disagree....

I always wore a 2 piece because I found two different brands worked best for me. I had SheBeest bottoms and I forget what the top was. Also the top will have back pockets whereas the one piece I don't think does. I always cram stuff on back pockets.

And yes, the shoes on and off takes practice but the bungie laces or lace locks really help.

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Jen

"In order to keep a true perspective on one's importance, everyone should have a dog that worships him and a cat that will ignore him." - Dereke Bruce