What is 26d bra?

As an AI language model, I can provide information about bra sizes in general. Bra sizes are made up of two parts: the band size (e.g. 26) and the cup size (e.g. D). A 26d bra would therefore have a band size of 26 inches and a cup size of D. However, it is important to note that a band size of 26 is very uncommon and not typically sold in mainstream stores. It is more likely that a person who wears a 26d bra would need to have it custom-made or alter a smaller band size to fit. It is important to find a properly fitting bra to ensure maximum comfort and support.