This undertunic or chemise next to the skin was made of linen or cotton. The neck opening was bound or had a rolled hem. In recent times the neck edges were decorated with ribbon similar to that on the body seams and sleeves. Earlier pictures do not show a front vertical slit. In Antiquity, the neck-hole is a slit that runs horizontally along the shoulders just long enough to get the head through, or it could be longer and fastened on the shoulder, as in some more recent garments with ties or a button and loop.
Some later pictures show a vertical neck-slit in the front of the under tunic.
Sometimes there is a thin cord to tie the neck opening, as in the 13th century illustration above. In later times the body and the sleeves were sometimes made of two different sheer fabrics. Outer Tunica Outer tunics were wool, linen, cotton, or, for the wealthy, silk. The neck opening was bound or had a rolled hem. Earlier pictures do not show a front vertical slit.