If in doubt, feel free to ask us our opinion regarding thread color/hat matches. We're here to help! For your convenience, we have added the thread colors used to create each embroidery design featured in the main photo on each product page. Check out the bottom of this page for Elite Fire Apparel suggestions based on our experience. 
Here is a list of thread shade suggestions that best match the hat itself, in our opinion:
Elite Fire Apparel Knit Caps - Vintage Dark Navy
Flexfit 6580/6277/110C/180 Delta/6110NU/6006 - Vintage/Dark Navy
Legacy Dashboard Trucker Black/Grey - Medium Silver
Legacy Dashboard Trucker Navy/Grey - Navy Blue is slightly better but Vintage/Dark Navy works too; Medium Silver
Legacy Dashboard Trucker Navy/Navy - Vintage/Dark Navy; Medium Silver preferred but any silver matches
Legacy Dashboard Trucker Red/Navy - Vintage/Dark Navy; any silver shade
Legacy Old Favorite Trucker Navy/Khaki - Vintage/Dark Navy; any silver; ask us about the best gold match as the khaki mesh shade varies with each shipment
Legacy Old Favorite Trucker Navy/Navy - Vintage/Dark Navy; any silver; any gold
Legacy Lo and Mid Pro Trucker - Vintage/Dark Navy
Pacific 404M(F) Trucker Navy/Navy - Navy Blue
Pacific 404M(F) Trucker Navy/Graphite - Navy Blue; Dark Silver
Propper Boonie - Vintage/Dark Navy
Richardson 110/111/112/115/115CH/585 - all Navy matches best with Vintage/Dark Navy
Richardson 112 Charcoal Mesh - Dark Silver
Richardson 111 Charcoal Mesh - Dark Silver (Medium Silver would look OK too)
Richardson 111 Khaki Mesh - Medium Gold