The neighbor's wife cleaning in see-through underwear is a sign that her husband is away and they're having an affair. (Hanagari Mai PFES-047)

One day, a neighbor was doing housework dressed in revealing clothing that barely showed her underwear, thinking herself incredibly lucky. However, the next day she saw her husband off in ordinary clothes, and the day after that she was dressed in revealing clothing again… and started having an affair with someone dressed in revealing clothing…