In my research thus far about Viking garb, it looks as though round brooches to hold up apron dresses were different in different areas where they were found. This suggests that different areas had different fashion trends for their brooches. The brooches show on this figure in the Saga museum are round instead of oval, which was apparently the style found in and dated to ‘Luistari, Eura, Finland, ca 1020-1050AD’ – Source: Quiet Press
Likewise, when I visited the castle museum in Turku, Finland, it was round brooches they had in their gift shop, not oval ones.
Further to this, I found a map via a poster on the forum biodiversity who posted the picture below, (Original source unknown) suggesting that the location of different gravesite finds of different brooch styles can suggest different ethnic groups.
The map shows that the “Gotland” style animal-head brooches were sporadically found in gravesites, mainly in Sweden. The oval “tortoise” brooches were found all over Norway, Sweden, Iceland, and Denmark, with additional finds in the UK and elsewhere. The round Finnish circular brooches were found primarily in Finland and the closest edge to Sweden, with sporadic finds in the nearest area. There have been no finds of these round brooches in Norway or the UK (where most of the original Icelandic settlers came from) nor Iceland itself.
Note: though I find nothing wrong with it at all, below is an image of a wax figure depicting a bare breast. If that offends you, I suggest you skip to another post.