Los hay en muy diferentes diseños, que en su origen identificaban los distintos clanes, los cuales incorporan símbolos del arte Celta, otros relacionados con su geografía o sus herramientas para la pesca.
"As a craft, the Aran Sweater continues to fascinate audiences around the world. A finished Aran sweater contains approximately 100,000 carefully constructed stitches, and can take the knitter up to sixty days to complete. It can contain any combination of stitches, depending on the particular clan pattern being followed. Many of the stitches used in the Aran Sweater are reflective of Celtic Art, and comparisons have been drawn between the stitches and patterns found at Neolithic burial sites such as Newgrange in Co. Meath.
Each stitch carries its own unique meaning, a historic legacy from the lives of the Island community many years ago. The Cable Stitch is a depiction of the fisherman's ropes, and represents a wish for a fruitful day at sea. The Diamond Stitch reflects the small fields of the islands. These diamonds are sometimes filled with Irish moss stitch, depicting the seaweed that was used to fertilise the barren fields and produce a good harvest. Hence the diamond stitch is a wish for success and wealth. The Zig Zag Stitch, a half diamond, is often used in the Aran Sweaters, and popularly represents the twisting cliff paths on the islands. The Tree of Life is one of the original stitches, and is unique to the earliest examples of the Aran knitwear. It again reflects the importance of the clan, and is an expression of a desire for clan unity, with long-lived parents and strong children".