I recently purchased two flannels and a great pair of vintage Lee jeans, with the perfect fade. Sometimes you have to look deep, but there are some great finds on
vintagetrends.com.
(Note: These are not the shirts and jeans I purchased, but are ones I am eyeing. If my direct links do not work, then those items have been purchased.)

source:
vintage trends
Flannel 1
Flannel 2
Flannel 3
Vintage Lee Jeans