I think different people experience the hug in different ways.
It can reach from collar bone to lower abdomen, or might just affect a small part of that area. For some people it goes right around, others may feel it only on one side of their body.
Some people experience it as a tight cramp, hug or squeeze.
Others experience tingling, burning, or aching. Sometimes it can last a long time, and sometimes it can be quite short and sudden. Or it can be felt as sudden sharp shooting pains. Different people describe it differently / have diffenernt experiences of it.
I get tightness, usually around my chest area but sometimes aroung my lower torso, as well as sudden shooting pains. ffor me, wearing a bra definitely starts it off or makes it worse. And at times I get a horrible weighted feeling in the top front of my chest, as though it is pulling me down, frontwards (sounds possibly similar to what you have described?) -But everyone is different. And not every odd feeling we have is attributable to MS - like awkward optimist said, anxiety coud cause similar symptoms. I would maybe just monitor it… see if it happens again, and if it continues to happen, talk about it with your doctor, who will be able to help you work out what is going on / if it is connected to MS / how to manage it etc xxx