English Other General / Conversation / Greetings / Letters history, national/regional costumes;

Hello all, I'm not quite sure what field to put this under - please change if you have a better idea, and perhaps it should be a non-pro question, too - the specific subject is German "Trachten" but my question is about a more general term:

I'm not sure about the use of "trustful to" in the passage below (along with a few other things...) The passage is quoted from a work by Albert Kretschmer who was around in the 19th century so it doesnt matter if it's old-fashioned, dated etc. but is it correct?

"It has been made repeatedly clear that all German farmers also adjust their exterior, once becoming more educated. They discard their traditional Tracht; the two things simply don’t seem to agree. The Altenburger seems to be an exception though. Probably none of his neighbors maintains the agricultural profession so carefully, none has more sense of literature and also taste for music, as the Altenburg farmer; still he remains *trustful to* his old Trachten culture and even if he might not be able to withstand the demands of modern times in the long run, he still displays an idyllic picture of folkloristic life today.”

I would instinctively write "faithful" (loyal) rather than "trustful" and, if "trustful", would have thought it needed a different preposition, not "to" - I've tried googling it but its hard to narrow down and I havent found anything conclusive - a fair few quotes from the bible, most of the others were actually not the same construction (the "to" was serving a different purpose) etc.

Target language is US English.