Amazon EssentialsWomen's Long-Sleeve Lightweight Crewneck Sweater (Available in Plus Size), Black, X-Large

Why aren't any of the Amazon essential clothes in small petite women's sizes? It's so frustrating not to find my size.

Is it warm enough?

I can't tell the difference online between brown and dark chestnut brown. I don't want one too orangy, also not too taupe, which should I choose?

Are the solid colors opaque enough for patterned tshirts underneath don't show through?