I bought 2 bras of identical size at the same time ( different brands).

The other bra fits perfectly around, as does this one, but the cups (despite both bras being 38c) differ greatly. I wear this bra as a sports bra. It is fitted, but comfortable. (The other is very baggy in the cup. There is zero cohesion of sizing for women clothes. I doubt any manufacturer puts any more thought into making sizes uniform, but I digress... )

Assuming that the reality of the actualy size lay somewhere in between the 2 bras that I purchased, I would say this one runs *slightly* snug in the cup. It's a good bra, comfortable and suitable for sporty endeavors or a trip to the grocery store.