Title made me think this was someone in just boxers I.e topless as well.. turns out it’s a non story.
99.9% not boxers if has pockets. If a similar length to boxers it could be swimming shorts being worn as normal shorts. Personally see no issue with shorts and t-shirts in lounge. I do however think Pajamas and dressing gowns are fine at home but not in public, not because I think it’s indecent but mainly because they just look like tools!