I have 2 of these Lane Bryant Blouses. Both are size 18.

This top is by Lane Bryant, size 18. Measurements are: Pit to Pit 22.5” and Length is 27”. The sleeves are 10” long and they’re cuffed. They’re made of 96% cotton and 4% spandex so they will stretch a little. I do have 2 and the measurements are exactly the same.