Merch during concert

I would like to try to get a sweater on concert night next week. Top choices are the usual blue crew and 1/4 zip but I’d be happy with any of the sweaters/ hoodies in a xs/ s size. I will not be able to line up the day of to stand in line before the show. I am wondering from those who attended last week if it’s possible to obtain a sweater if I plan to go during the concert… Is there still a decent line while Gracie is on? And if I wait until I take a pee break middle of the show (eg during Red or 1989 set), is there any chance of merch still being available?

ETA: I wasn’t super clear- I realize chances of blue crew and quarter zip are very low/ nonexistent. I am wondering if I go to get merch while Taylor is playing if I would have a chance at getting either the black or beige hoody in a small or x-small.