This is a derivative of PinkLemon's Bowtie Collar import. It adds shading and RGB support. This is a vanilla import; it includes no special scripting and has no prerequisites.
The collar supports normal RGB adjustments. The Collar.RGB1 slider controls the bowtie proper, while the Collar.RGB2 controls the neckband. It is possible to set both sliders to the same color, or to use different colors (refer to screenshot above for examples).
Flash modders can find the source file on mega.nz. Normal users can download the SWF file via the link at the top of this page.