I used OCR and online translation on the notice in the 2nd picture of
https://forum.oneclickchicks.com/sho...7&postcount=11
and got:
СЕСТРЫ !
ПРОСИМ ВАС, ОДЕВАТЬ
КРЕСТИЛЬНУЮ РУБАШКУ,
ОСТАВЛЯЙТЕ ПОД НЕЙ
НИЖНЕЕ БЕЛЬЕ.
ИМЕЙТЕ БИИГООБРАЗНЫЙ ???
---
SISTERS!
WE ASK YOU TO DRESS
[Christmas/Baptismal] SHIRT,
LEAVE UNDER IT
UNDERWEAR.
HAVE A BEAUTIFUL ???
===
It seems, in that place, women are asked to keep their underwear on.
Perhaps someone who reads Russian can do a better translation.
Others have shown that the winter pictures are of Epiphany (called Theophany by the Orthodox) where they celebrate the visit of the Wise Men and the Baptism of Christ on the same day, hence the immersion in water. Nicer in the Mediterranean in January, where this custom began. Most of the jumping into icy water is done by young men - but for some reason women tend to be photographed more often!
January 19 in our Gregorian calendar = January 6 in the old Julian calendar, which many Orthodox use for religious purposes.
But, it does not answer the question from the original photos - why is this is happening in summer? Perhaps it is a Russian Orthodox community in the southern hemisphere where it is summer in January.