I have 4 buff orpington hens from TSC that will be 3 years old in a couple months. Here are my fluffiest ladies, Chungus and Dingus, both around 6lbs:
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It took them both some time to get to that shape; they were much leaner-looking for a long time.
And, uh...then there's Dimple. She's a tiny 3lbs. She has two lovely sons that are also really on the smaller side given their dad is a reasonable standard size, so her smallness is clearly somewhat genetic and not just a developmental anomaly. I sort of wonder if Dimple is what happens when a bantam roo sneaks into the hatchery flock or something lol
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My 4th buff orpington girl, Buddy, got really confused with her molt this season due to weird alternating warm and cold weather, so she's still not finished replacing feathers and looks a mess...so I don't really want to post a picture of her. She's more narrow, but otherwise the same size as Chungus and Dingus.