At the beginning of Harlots, Holli Dempsey is topless briefly while having sex. Then a few minutes later we see Holli’s ass and some sideboob as she has sex again but we do not see her face in the same shot.
That’s all the nudity from the main female cast. Eloise Smyth shows a bit of sideboob near the end of the episode and there are a few random topless extras scattered throughout.
Harlots airs on ITV Encore in the UK on March 27 and then on Hulu in the US on March 29. There may be some differences between the two versions.