What type of thread/ lace should I get?

[DavidH1827]

I've already gotten loads of good advice on my previous thread, but I'm curious as to what type of Lacing or thread I should get to use on a knife sheath. The Lacing looks quite thick and durable but is that what I should go for? There also seems to be multiple different types of both to choose from as well. What do y'all use on your knife sheaths and is there something I should use to prepare the thread or what have you prior to stitching?

[Tacheny]

I use Maine Thread CO. .035 waxed poly thread. I find it to be the perfect size between too thick and too thin. It’s durable and will age well.