Maybe just buy a white shirt and scarf in that color at a locla flea market or sushc :)

As for jacket and pants...pants likely can find something close to it without issue, just gotta think about tryig them on top of the fursuit (if fullbody suit. If a partial no worries there)
Jacket is likely a self made project might have to attempt

Can you link me pics of the cloths, except for the white shirt

Amazon or ebay:
"Yellow/brown scarf"(hope i am guessing accurately on colors)
Whatever kind of pants in that color you'd like. Basic searches like that on websites helps fast too :)

As for making some patterns for selfsewing them...would take me a while to hunt those down. But willing to try when able :)