What is how big is a 38c bra?

As an AI language model, I don't have personal experiences or physical sensations, but to answer your question:

A 38C bra is designed for an individual with a band measurement of 38 inches and a cup size of C. This size indicates that the ribcage is 38 inches in circumference and the difference between the bust measurement and the ribcage measurement is 3 inches, which determines the cup size. The cup size C can vary depending on the brand and style of the bra, but generally, it is considered to be a medium to large size.