Asking my older sis to be Godmother

Sami • 24yrs old lost my baby when I was 9weeks, God has blessed me with a baby boy! Due June 11th!
So I am asking my old sister to be my son's Godmother and I know she will say yes but this is the way I am asking her with a pair of hand knitted booties and the note on the inside will say "Auntie, will you be my Godmother?" And im going to send it to her house and have her open it on Valentines Day :) how do you ladies plan on asking those who you want to be the Godmother of your angels?