This paper is about 33 crocheted shawls, so called heart warmers. The shawls were included in an inventory of crocheted parts of the national costume in Nås in Dalarna, Sweden. The inventory was performed betwee 1993 and 1996. The heart warmers are an important part of the national costume in Nås. They have traditionally, without any interruptions, been worn together with the women´s national costume since the 1860s. The heart warmer has several purposes. It warms the chest and the back of the person wearing it. It is beautiful and tells everyone in the vicinity that skill, time and desire to outshine each other have been put into the labour of crocheting it. This paper investigates how the heart warmers differ in terms of the various crocheted pattern images in several colours, and whether it is possible to determine which models have been used for these different pattern images. To find originals of the pattern images, studies have been performed on items from Nås. The items studied can be found at Nordiska museet (the Nordic Museum) in Stockholm. Those are items that belong to the Nås national costume, as well as items that were in a home in Nås during the second half of the 19th Century. Patterns in printed sources, for example books about embroidery, have also been studied. These studies have made it possible to find originals that could have been used as inspiration.