does the shawl button in back, or go over the head to wear such as a collar shawl ( the photo looks like a collar shawl) or open in back?

it has no button in the back,and it is go over the head(a hole in the head)

Is Purple true to color ?

I have no idea. I bought the Navy Blue and it is very much true to color

What is the length (in inches) of the shawl in the back. (If you don't know, please don't answer. It's not helpful.)

The chiffon shawl is 12 inches in front, and 23 inches in the back, dear.

I am 5'1' tall and weigh 119 pounds...Will this swallow me?

My wife is 5’2, 110lbs and it fit beautifully. She feels comfortable in it and felt like it fit her perfectly. It comes down just below her bottom in the back and just below her breasts in the front (she is bustier than most, though, so it may come down a bit lower for others). She felt very elegant in this item and highly recommends it.

ASIN	B073WQ1346
ASIN	B0FXWVX54J
Best Sellers Rank	#9,527 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #14 in Women's Wraps & Pashminas
Brand Name	Pukguro
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (2,026)
Date First Available	July 13, 2017
Department	womens
Fabric Type	Chiffon
Item Type Name	Pashmina Shawl
Material Type	Polyester
Pattern	Solid
Product Care Instructions	Hand Wash
Size	One Size
Style Name	Elegant,sleeveless
Target Audience	Women
Unit Count	1 Count

Pukguro シアーショールとラップ イブニングドレス用 シフォンケープ レディース ソフト ウェディングカバーアップ, ブラック, One Size

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Pukguro シアーショールとラップイブニングドレス用シフォンケープレディースソフトウェディングカバーアップ, ブラック, One Size