"Sheath" dresses?

It has to do with how the seam is cut from top to bottom of the dress. Have you looked under the "Dresses" category on WW? It has a lot of good pictures of sheath dresses and how they fall on a bride's body.

They kinda just hug you body to hips. They're similar to mermaid or trumpet but don't flare as much at the bottom. I personally bought a sheath dress and love it!

A sheath dress is basically flat from shoulders down. Not for people with a big bust or butt without serious alterations.

Here is one by Maggie Sottero: http://www.maggiesottero.com/dress.aspx?style=4MS997&page=0&pageSize=36&attrib30=275&keywordText=

It's also called a "column" dress. Basically, it is just a long gown, not super form-fitting, and usually without a long train.

Sheath is like a colume dress usualy straight down form the waist

it has no extra poof like a ballgown

and not alot of structure like a mermaid

https://www.pinterest.com/pin/14355292538212937/

this is the best example

Awesome, all the ones I seem to like keeping saying they are sheath so I thought I should figure out what that meant. =]

I feel like Beka's description is the most accurate. If it helps this is my sheath dress. I was particularly fond of it because anything too structured around my hips accentuated things I don't like about my stomach. Originally I wanted an a-line but I fell in love with this one first (ETA: this is unaltered of course)

There are a lot of helpful images if you search Google Images for "bridal gown silhouettes," like this one:

http://www.bridalguide.com/sites/default/files/blog-images/fashion-beauty/wedding-dress-silhouettes/gown-silhouettes.jpg

This is the stock photo of mine and one that i posted in my mini BAM. I believe the sheath dresses can come in all different shapes for how they flair or don't on the bottom, as far as i know they tend to be more slinky than having a shape on their own.