For "classic" brevet bikes with tires around that size, you really must look to the French framebuilders. Alex Singer and Rene Herse are the big names, but there were others.
A drop bar bike with a 700x38 tire was essentially unheard of in North America until around 10-15 years ago, with the exception of the Specialized Expedition touring bike of the 80s. OK, on second thought Rivendell started up in the mid 90s, but they were alone. There were possibly some boutique custom framebuilders.
Nowadays, there are many options. Perhaps the three most obvious suppliers of that style of bike in the USA are Rivendell, Velo Orange, and SOMA.
Atlantis - Our best selling touring bike - by Rivendell Bicycle Works
Double Cross (Complete Bicycle) | SOMA Fabrications
VO Campeur Frameset - Campeur - Frames