Short answer. White, bone, or a navy close enough to disappear. A bright layer will stripe through a V-neck and look unfinished.
V-neck reality
The Classic V-Neck shows a triangle of whatever you layered. Make that triangle boring.
Black navy mismatch
A black undershirt under navy can look like a second uniform. Match or go lighter-neutral.
Shop medical scrubs at Yireh
The Classic V-Neck set ($86), The Zip-Front Jumpsuit ($98), and The Fashion Flare set ($86) are built as medical scrubs — nine colors, real pockets, a cut you will still wear at hour ten. See Navy Blue on the body.
