Noun nightie has 1 sense

1. nightgown, nightie, night-robe, nightdress - lingerie consisting of a loose dress designed to be worn in bed by women
   --₁ is a kind of lingerie, intimate apparel; nightclothes, nightwear
   

Nightie

A nightie, also known as a nightgown, is a comfortable and lightweight garment worn by women for sleeping or lounging in bed.

Usage Examples:

• She changed into her cotton nightie before going to sleep.
• My grandmother prefers to wear a silk nightie for utmost comfort.
• I bought a new nightie with lace trimmings.

Possible Related Products on Amazon:

• Women's Nighties
• Silk Nightgowns
• Cotton Nightgowns