I had a chicken once, one of six chicks- who was soooo delayed in her growth and feathering...she looked like a bad joke. She was the brunt of all sorts of sad nick names. I honestly suspected she'd been exposed to radiation at some point. As a chick, she dropped all her down, with out filling in with feathers, except wing feathers! She was bald! Then she got body feathers, but no head or tail feathers! She eventualy got covered in feathers- but nothing after her legs! I mean nothing, no tail, nadda. She looked like the back half of her had been cut off. It was the weirdest looking chicken you ever saw. She was like that until she was almost two years old, and then suddenly she grew a tail, filled out her colors and she was one of the prettiest hens I had- but it took 2 years!
Just like the story of the Ugly Duckling! Hope yours turns into a swan too! Good luck, Molly