Karavi beach, a little further around the headland (but only 15 minutes on foot south from Livadi), may be a better bet at these times; however there is development of a group of holiday houses there. A report from August 1999 describes thin crowds (even in high season). Nudist families and older nudists (40-60). Plus, several groups of young males (clothed) there to ogle the few nudists. (The poor, pathetic souls - it's obviously the only way they can find out what naked girls look like.)
Another correspondent who visited in August 1999 did not see any nudists on Livadhi Beach, but in the northern part of Karavi Beach there were about 10 nudists even at high noon, and in the evening more nudists appeared and they stayed there at nearly eight o'clock, including families. The water was clean and calm. Those were happy days!

2005 September / October: Karavi beach was completely naturist, despite some housing development just at the back of the beach. This is quite a nice little beach, but it has a negative feature that seems fairly common in the Cyclades: a strip of flat rock just as you enter the water (this is the case with parts of Plaka on Naxos and Kommos in southern Crete). This is despite the beach being sandy and there being more sand about five metres into the water. It is a particular problem because the rock is very slippery. My contributors wore plastic water sandals, however, and this solved the problem. Water sandals seem antithetical to naturism, but they are very practical. (The Captain hates them but they do have their uses.)

2007 July: According to Barefoot reporters, Karavi was half nude, half textile, when Livadhi was entirely textile.

2016 June: Karavi beach was almost completely nudist.

2020 September: We visited Karavi beach every day of our stay in Serifos. Very few people on the beach. In its left part, 100% nudist. Ideal if the north wind blows strong. Possibility to lie on the stones (without sand). On the right part, mostly textile, but only a few people present. Sea not easily accessible because of slippery flat stones and/or pebbles. Access on the nudist side seems easier. Sea shoes may be useful. Relaxed atmosphere

2021: Kavafis reports Karavi is a very beautiful and quiet small beach. There were two topless women when we went there. The problem we found is that this beach is not at all secluded: it lies in front of a group of houses, and we could see some of its residents at their verandas. We didn't feel therefore comfortable to get fully naked there, in spite of the many reports about being a regular nudist beach.