Along with the duck-egg blue paint, you need to get your hands on a grey vest top. These are pretty easy to come by but if you have an old grey t-shirt lying around, feel free to cut the sleeves off, add a little stitch for a hem, and you’re good to go.
Marceline wears blue tight-fitting bottoms which can be replicated with blue jeans or blue leggings.
Marceline’s boots are also fairly easy to replicate. If you want these to match perfectly then red is the way to go. Make sure they are above the shin but below the knee. The red looks great against the blue jeans and will give your costume a bit of an edge.
If you can’t get your hands on any, you can create or buy some red boot covers or brown boots can work to complete look. Just be sure they are above ankle length to be true to the character.
Marceline’s axe-shaped guitar is the staple of this look. You can buy plastic replicas online and in some costume stores, but you can make this guitar from craft foam, all you need is a creative eye and some good paint!
The Guitar is a double headed axe shape so be sure to replicate this and of course make sure to keep it red. Then there’s Marceline’s signature hat. For this you’ll need a wide brimmed sun hat, get some pale blue ribbon and tape it around where the brim meets the hat itself.
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I’m not mean. I’m a thousand years old, and I just lost track of my moral code.