Does it include the head piece?

No, you have to purchase it serperate.

Hello I'm interested on this dress very much, can you send it to méxico or to a P.O box in usa?

Costumes TO Die FOr can ship to Mexico or a P.O. box in the United States. There are many sellers of this item. Some ship to Mexico and some do not.

Hi. I am 5' 2" & wear a size 8 or 10. Will this fit me?

Hi there!We have provided a size chart below for your convenience.Measurements are stated in inches.Size Standard | Bust Size 34-38 | Waist Size 26-32 | Hip Size 35-41 | Dress Size 6-12Have a great day!

I am not fitting into any category - 34 waist and 40 bust. Should I get an extra large and adjust to fit?

It was odd bc the description online said something like "one size" but when the product arrived it had a sticker on it that said Size 14 so it was plenty big and I usually wear a 10. I can't guarantee you'll get a bag that says Size 14, but I did, and it fits fine with room to spare but also doesn't look too big.