The streams I used to fish in New Jersey had small BWO. Here is an example of a simple pattern for the dun and the emerger, tied on Mustad 98480 #18 and #20
Highly overfished public water, so the fish were quite picky. These patterns were taught to me by by NJ fishing buddy Mark Rosenbach.
Dun
Thread: Uni gray 8
Tail: microfibetts, split
Abdomen: synthetic olive microdubbing
Hackle: blue dun
Emerger
Short shuck rather than tail
micro dubbing olive
wing: blue gray antron looped or cdc looped works well