The key to decorating a skinny Christmas tree is to work with its shape rather than trying to hide it. A tall, slender tree can be the perfect backdrop for a minimalist and elegant look. To make the most of your space, consider using a simple color scheme with a limited number of decorations. Start with a few larger pieces such as a star or a wreath to give the tree a focal point. Then, add some smaller ornaments, such as glass balls or silver bells, around the main piece. Finally, don't forget to light it up with some fairy lights to create a warm and cozy atmosphere!