I have been wanting to write a history of this for some time, but Pastor LeCroy has provided a short history of the wearing of clerical collars in the Presbyterian/Reformed tradition.
Rev. LeCroy observes:
When Reformed pastors would enter the pulpit, they would add what is known as a “preaching tab” or “neck band” to their clerical dress. This type of dress is nearly ubiquitous among 17thand 18thcentury Reformed pastors.