I have the Smart Wool no shows like Suz. They are ( or at least we’re) available on Amazon. I got mine first at REI. They come in a mostly neutrals but you may want to find a low sock near the color of your ECCOs, so if it shows, it will look deliberate. My ECCO sneakers are silver metallic and I found silver metallic low socks at Nordstrom. They might be Hue brand. I don’t remember. The grey Smart Wool also look good.