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The local costumes are extremely picturesque, and are well seen on the day of St John the Baptist, the patron saint. The men's costume is similar to that worn in the district generally; the linen trousers are long and black gaiters are worn. The women wear a white chemise; over that a very small corselet, and over that a red jacket with blue and black velvet facings. The skirt is brown above and red below, with a blue band between the two colours; it is accordion-pleated. Two identical skirts are often worn, one above the other. The unmarried girls wear white kerchiefs, the married women black. One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "FONNI". Encyclopædia Britannica (11th ed.). Cambridge University Press.
Neighborhoods in Fonni are called "Rioni" of these the oldest is called "su piggiu" or the skin, probably derived by the fact this is the highest and first layer of the village. Others include "puppuai" and "cresiedda" to the south, "logotza" to the east.