This is a really easy corsage to make. I made it from an old suede jacket I had.
Basically, you cut 5 circles of the same size, with each circle you fold it in half and sew it into a semi circle using a blanket stitch. When each circle for the base is done, cut a small circle of suede to sew the 5 semi circles on (arranging them overlapping).
Then cut another 5 smaller circles out and do the same (semi circles) and sew them onto the others.
To finish, add a vintage button to the center and sew on a brooch backing and voila! A lovely corsage!