Sun Zero Brick Solid Grommet Room Darkening Curtain - 54 in. W x 84 in. L 43512 - The Home Depot
HACK - I attached my MAJGULL blackout curtains to my SANELA curtains using leftover RIKTIG wire curtain hooks. Way easier than everything that I was thinking of doing. It looks and works
Amazon.com: AIMM Cotton and Linen Curtains Blackout Curtains for Bedroom Use Texture Linen Thermal Insulation Curtain Eyelet Grommet Curtain for Living Room-Orange 150x270cm(59x106inch) : Home & Kitchen