Here's a poem by C. Fox Smith from the World War 1 era, about knitting for the troops:

THE KNITTERS

In streets that are humming
With the city's stair . . .
Or where leaves fall rustling
Through the quiet air . . .
There are women knitting
Everywhere . . .

Knitting and waiting
Through hours like years —
Not with loud grieving
Nor sighing nor tears —
In their hands the needles
Flash like spears.

Every thread a sorrow,
Every strand a prayer —
("Oh, where sleeps my dear one?
Or how does he fare?")
There are women knitting
Everywhere . . .

Notes:

From Sailor Town: Sea Songs and Ballads, edited by Cicely Fox Smith, published by George H. Doran Co., New York, US, © 1919, p. 131. Earlier published in The Naval Crown by Elkin Mathews in 1915.

Composed during the first year of World War 1 in tribute to those who waited for their loved ones at home and quietly knitted.

I don't believe it has been adapted for singing.

Cheerily,
Charley Noble