French cuffs when unfolded should have 4 holes at the end of each sleeve. Once folded, you should only see 2, one on the outside and one on the inside. These holes are then fastened with either...
Simply 'Thumb Holes'.
cuff links.
A shirt is 'une chemise' (fem.) for a man's shirt, or 'un chemisier' (masc.) for a woman's shirt.
chemise.