Gift for my wife

My wife really wants a knitted ‘shell hat’ for her stuffed animal snail, and a vest for her platypus.

I picture the shell hat as more or less just a beanie with a tailored bit to fit the shell shape and to accommodate the overhang of the shell, and the vest doesn't have to fit super snug, just something to put his front legs through, which already have custom knitted mittens.

I hope to have the shell hat to be teal, and the platypus vest to be snail green.

If this is not possible I understand, but I had to try.

Thank you.

PS: I have attached picture of the stuffed animals, with a measuring tape beside it to help. I can send more if it will be helpful as I was only able to attach 3 pictures.