It was just a light-hearted zinger, her viewers pretty much unanimously told her not to worry about it.On PagiMoona someone asked Moona why she wasn't eating on stream, so she replied that basically that she wanted to respect viewers during this time. However someone flustered her by saying that her 3D was too revealing to be using during ramadan. I don't know if she decided to switch to her 2nd outfit for the rest of her streams for the next month or not. Good job debuffing your oshi assholes.
Edit: It was 10am Indo time
For Mamah Moona streams she's always used her 2nd outfit anyway, and last year she used her regular outfit without issues (she released her Villain cover with a revealing costume during this period, even).