A bilingual essay on 'the advantages resulting from the preservation of the Welsh language and national costumes of Wales', published by Lady Llanover in 1836.

In the essay, Lady Llanover encouraged the women of Wales to wear Welsh flannel. She was concerned about the popularity of more fashionable fabrics, such as silk and cotton, among the younger generation. Her aim was to promote the wool industry and instil a sense of pride in traditional dress.