For her solo dinner, Rihanna quite literally put a bow on maternity dressing in a gray sleeveless JW Anderson dress with a thigh-high slit and an oversized bow accent, placed atop her baby bump.

Anderson, out in New York City yesterday, slipped into a knit maxi dress from Khaite in an off-white hue that the brand dubs “Flax.” The luxe design, which clung loosely to Anderson’s figure ...