In the summer time, when it's hot and humid and additional clothing layers can be uncomfortable, while sitting at home is a man allowed to wear just a t-shirt or is it necessary to have the tzitzit on at all times?
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Tzitzis are never required to be worn all day. However we who choose to wear them at all times have no diffrentiation between at home or outside. A kippa may or may not be a different story but as far back as the times the shulchan aruch and maharshal seems everybody was wearing them everywhere.