There was a centre of hat production in the parish of Llangynfelin in north Ceredigion.
FELT HAT PRODUCTION
Llanddewi Aberarth, Llangorwyddon, Llanrhystud, Lledrod
Many hatters from Llangorwyddon [Llangorwen near Tre’r Ddol?] to this place and about the mountain on account of the plenty and cheapness of Tanwent (fewel) [Fuel] which is peat and affords all other kinds of fuel the most regular heat, Lledrod hats are hawked all over south Wales and for everyday wearing are found by the common people to be the best known, the wool of this district it is said felts better than that of any other part of Wales or England.
Sheep of Lledrod district, and thence to Lampeter their wool remarkable for its whiteness of their wool [sic] and in great esteem for flannels and with the Yorkshire clothers who say that it works extremely well, it is moderately fine. The Codwool is uncommonly fine and used by the hatters instead of beaver to furr [sic] their hats. Some of those hats sell for a very high price considering they are but mere woollen hats, from 8s to 10s
Davies, Walter, NLW 1760A, notebook 4, Itinerary no VI, 1802, Pembroke to Cardigan, pp. 15-17
Cardigan wool very much esteemed by the hatters, it felts better, they say, than any wool in Wales.
Davies, Walter, NLW 1760, Notebook 16, [1802??], pp. 1-5
2 or 3 hatters at Tre’r Ddol near Garreg, at Llangyrwyddon [Llangorwen near Tre’r Ddol?] etc.
Davies, Walter, NLW MS 1762Bii Notebook 3 [Journal XVI?? or XYZ], p. 128 (old p. 28)
At Tre’r Ddol [in the parish of Llangynfelyn] saw several weavers’ looms and many black hat makers, counted 31 hats drying at one house.
Thomas John Masleni, Sketch of a Tour of Scenery in Wales, 1826, NLW Add Mss 65a, p. 99
‘The Cardiganshire wool has long been noted for its felting quality, owing to which, and to the cheapness and abundance of peat fuel, the hat manufactories are very numerous: in these are made most of the common hats worn in South Wales, which are strong and durable: the wool of the Michaelmas shearing is the best for this purpose. The above manufactures consume the greater part of the wool produced in the county’
Samuel Lewis, Topographical Dictionary of Wales, 1833, ‘Cardiganshire’