Anyway, differences between the Synod congregations and Hauge congregations were very noticeable for some decades after the 1917 merger. Looking through church yearbooks, you can see early "Synod" years where the pastor wore full vestments, often with a ruff. Some years later, you see the vestments get simpler and simpler until it got to a point where many pastors were simply wearing suits. The "low church" mentality was part of the Haugean DNA spreading even into formerly non-Haugean congregations.
I would argue that what you see in yearbooks doesn't necessarily reflect the use of vestments in parish practice. In some cases it might, but as I mentioned in a previous post, if anything, the practices of the Hauge Synod were pretty much lost after 1917. Of course, it's a complex issue, with a lot of "cross-breeding" between the different pieties.
