Here are a few ideas.
I dressed up "Button" for Halloween.

She is only 18" here, so dog costumes fit her. The Witches outfit is a dog costume I got at Super Petz.

The Angle outfit was a children's costume

The devil horns were mine!


Here are some Christmas ideas...
I've used large dog collars with jingle bells on them for around a minis belly or neck. I've used antler headbands & santa hats made for people. I use little girl's christmas scrunchies for around hooves. Take a red horse sheet & attach white fur around the edges & put a black belt around the middle for a Santa "look".
Just use your imagination. This time of year there are all kinds of christmas things around that you can put to use! Oh...another one is to put a Christmas wreath around their necks!
And here is an outfit I made for a filly a few years ago. It was an actual "Union suit" (red long johns with trap door) Of course, I had to attach some lace & make her a little sleeping cap to match.

This was for the Great Outdoor Underwear Festival Parade.

Everyone had to dress in some type of underwear.......very interesting parade that always got National attention. They even had celebrities send in autographed underwear that the town hung up right thru mainstreet & auctioned off!