The trenchcoat I have is an “all-weather” trench. I knew it was at least partially synthetic, but it turns out that both the shell and liner of the trench are entirely polyester. That’s great news, because it means that I can burn the holes into the trench for the LEDs. It is not only convenient, but burning the holes also melts the edges, cauterizing the holes so the fabric won’t fray. It’s really perfect.Tonight I cut a bit of the liner out of the hood (which I’m not planning on using in the final piece) and used it as the subject for an LED mount test. I burned the hole with a large-scale soldering iron, and that was super fast and easy. The actual mounting is nearly the same as with my previous Anthrolume suit – push the LED barrel through the hole from the back, then affix a washer onto the front.
To save weight this year I’m using nylon washers. I’m still trying to find exactly the right size, but in a pinch 0.443" inside-diameter washers work. (I have to actually stretch them slightly before putting them on, but then they stay very well.) These particular washers are tight enough that I would probably destroy the LED trying to remove the washer – so instead I do what you do with nylon wire ties – just cut it off with a pair of flush cutters.
Now that I’ve done this test I’m more jacked than ever to actually mount all these LEDs. I don’t have the washers yet, but you can bet I’ll be burning holes like a madman over the weekend.