Hallo liebe cuties

Ich danke euch für die Hilfe,war genz gut
Lgr,from Germeny

Ich sehe man hat Dir schon die Antwort gegeben. 80/12 oder 90/14 spitz per Allstitch. Viel Glueck mit der Lederstickerei.

Glad you got your help Lammy, this is excellent information to keep nearby your sewing machine. Love Chris

Here is a link in English but you can use Google language tools to translate, that tells you what needles to use for what fabrics.
If you look down on the page a little it tells you the needle you need to embroider on leather.