Here is the fly pattern sheet for the Emerger Ida May, developed by Charles Brooks.
Size 10, 1XL, light wire
Very webby grizzly dyed dark green
Fine gold wire
Furry Foam, beige, split or separated
Webby grizzly dyed dark green
The body calls for a strip of Furry Foam, which I show below. Use a green Pantene marker with a black marker over the top of green to color the tan Furry Foam body. This process makes a multi-color body.
Fly pattern from Charles Brooks’ book entitled The Henry’s Fork (1986) in Appendix C, page 201.