Duck Tape "dress" Form

Hello Everyone,

I'm a bit sheepish to ask this question now that I've visited several
of your sites & photo places!

Ah well, here goes: How can I sew a cap or something over the arm &
neck holes and arse opening on an improvised body form so that I can
successfully stuff it with sawdust?

We foster senior Cairn Terriers for a rescue. Our newest fellow,
Duffy, has a hand-sized patch of alopecia (lost hair) on his back at
his shoulders. The rest of his fur hasn't grown back yet from a
shaving, so we need to protect that area from the sun; also I wanted
to make him a few belly bands. Hence, the "dress" form.

So! I made arm cut-outs from a longsleeve jersey shirtsleeve. Pulled
it over his head. Then, proceeded to put 8-10" strips of plain ol'
duct tape over the jersey material. Made line up marks over the body,
and cut it off him horizontally. (For a moment there, he looked like a
Space Dog.) The cuff of the shirtsleeve can either be a turtleneck
measurement for the dog garment or where the cap would go to keep in
the sawdust.

Pics are available, but I'd need to know where the best place is to
make a picture sharing account.

Thank you!
JoAnn