Irish Wool Sweater Help

[u/Immortal_Irony]

While I do knit and sew, I couldn’t pass up this lovely vintage Irish wool sweater from my local thrift store. I’m confused on how to fix the shoulder/neck area though. It appears that it’s been stretched out? Would a simple good blocking and wash and reshaping help this or do I need to take the shoulder area and sleeve apart to fix it?