Hi, thanks for writing to HCM.
I don't think that there is any necessity of wearing a brace or wrap for a suspected hairline fracture of a single rib. Just simple form of immobilization in the form of avoiding pressure on the affected area and lying on the affected side while sleeping is more than sufficient. Rib fracture
will heal uneventfully within 3 weeks.
Take regular calcium supplements
for a few weeks.
Hope this information is helpful. Good day