Heart-bit? No, I don’t mean smitten with love, phrased in a folksy sort of way. I mean a little bit, or piece, in the shape of a heart! Worn right over the heart.
That perfect specimen of plain sewing, The Shirt, has a romantic soul. Back in days when shirts were only slit down the front, and not buttoned closed the full length, that end of the opening was vulnerable to tearing. There were various ways to prevent it, and I came across references to this lovely way when researching early sewing instructions. For example, Instructions for Cutting Out Apparel for the Poor, 1789, gives a description of cutting linen for shirts:
This half overplus being a quarter of a yard in length, serves to cut out hearts for the bosoms.
Or a sewing manual from 1833:
Before commencing the shirt, small pieces of muslin are given to each girl, for the purpose of learning to settle in, and work the breast-gusset.
Of course not all shirts had them. Some had a triangular gussets, or a buttonholed reinforcement, or a tiny rectangular piece to prevent a tear, and some had nothing at all. But you have to love linen with a heart!