I NEED HELP

Riley

Ok so on Thursday I’m going out to eat with my boyfriend his mom and his grandparents I’ve already met his mom but I haven’t met his grandparents and I don’t know what to wear and I asked about you my friends but like some of them are saying that I should wear the first one and some of them are saying that I should wear the second one so I don’t know but I need help should I wear the flannel or the longsleeve shirt