Nyong'o, 42, wowed photographers on the steps of the Metropolitan Museum of Art on May 5 when she ascended the steps while wearing a head-to-toe suit ... button down shirt in the same pastel green ...

I'm dubbing the colour 'pistachio', although others might call it 'spring green' or as it's officially known, 'apple green'. Cat wore her suit in a ... with a side button fastening.

"These evergreen slim fit trousers are crafted from a virgin wool blend and feature a high rise, a button and zip fly ... User @goosegirlenfys commented: "Green suit season!