Hi @Anonymous
Thanks for the better image!
This does look unusual and would usually mean the topology on the shirt is incorrect but it looks fine plus when you smooth it smoothes like it should.
A simply test you can try is deleting your settings/preferences and also checking your GPU drivers to make sure they match our certified hardware list.
You can find our certified hardware list here!
Finally, when you get a chance, can you please zip and attach the scene file here or via dropbox/google drive or another file sharing program so I can take a look at it? If the file is confidential or under NDA please send it to me in a private message instead of posting it here.