Part of Speech: Noun
Definition: a small piece of linen, silk, or other fabric, usually square, and used especially for wiping one’s nose, eyes, face, etc., or for decorative purposes.
Found in “Folding My Clothes” by Julia Alvarez
“ my panties strictly packed into the size
of handkerchiefs on which no trace
of tears showed.
The speaker is using handkerchief as a reference to size, by referring to something small.