Silkworm Eggs Location:

Fall: Backwoods, Railroad, Mountain for Luna
Any Season: Desert for Tropical
Spring: Forest, Town and Bus Stop for Domestic
Spring, summer, and fall: Secret Woods for Oak

Tailoring Recipes:
Cook Bandana: White Silk Cloth + a breakfast item (Pancake, Fried Egg, etc)
Rider Bandana: Black Cloth + Alcoholic Drink
Rogue Bandana: Brown Silk Cloth + forageable item
Thriumphal Crown: Gold Silk Cloth + Yellow Silk Cloth
Silk Tunic: Cloth + White Silk Cloth
Mimic Shirt: Cloth + Black Cloth
Black Vest: Black Cloth + Black Cloth
Peacock Feather Hat: Cloth + Peacock Feather

How to obtain different Peaock Variants:

Via Egg Hatching in an Ostrich Incubator - All peacocks produce the same feather, since it could be very difficult to get the Peahen, I only enabled the base versions to be purchased.
There are no Peahen Variants