I can give you tons of tips - you can PM me if you need to.
Here are the NEVERS:
- NEVER shoot upward on a plus size person
- NEVER use a wide angle lens & then shoot up, or at parts people dont want large
- NEVER just shoot - always pose/ angle according to their shape
- NEVER do poses that you see on size 1 models (most of those poses make certain parts look larger)
This is what I do - for each client (regardless of size/ shape)
I help them pick out clothing that flatters their shape and coloring. They bring a few things to choose from. I almost always lean towards solids, except on babies. Structured clothing ( fitted jean jacket for example) and layers will help your subject look 10 lbs thinner before you even take their photo. So we pick out what works best.
After they have the outfit on, I ask them to turn. Here's what I'm looking for:
What is the WORST possible angle you could shoot this person from? - Then NEVER do it.
2nd, I look for their most curvy angle. This varies based on shape. If they turn 3 times slowly you can find it.
Next, pay attention to shadows. Shadows below the bustline and along the sides shaves off another few lbs. Shadows are the plus size person friend - so pay attention. If you cant tell where the shadows are - hold out your arms and watch how the light is covering your skin. You want her sides in the darkest part.
People that are apple shaped (carry most weight around the middle, in front) tend to look best shot straight on (IF their clothing fits right). Watch the wrinkles in the clothing. It helps.
Then these are general tips - never shoot full length images. You can take some to see wha they look like, but generally speaking, that is not the most flattering pose. If you have to shoot full length, getting 2-3ft higher than they are and shooting down helps. What the S curve (otherwise their butt will look HUGE). If you shoot down with a wide angle, that will also help a little bit if they have super wide hips.
Also - Keep her arms AWAY from her body! Hands on Hips, in pockets, etc makes a natural space b/t her body and her torso. And notice the model Brad shot - he has the top facial planes only - you can't see her chin (or double chins - if she has any). That is important.
I prepped our intern for this kind of stuff before a plus size bridal shoot she did. Here are some of her shots where she got most of the components:

This was taken from about 3ft above the bride.

Notice her shoulders are covered - cover the arms and shoulders with something if they choose to go strapless/ sleeveless.

Notice the seaming on the dress - she shot it right along the seam, which is usually one of the curveyest angles to shoot.

You can shoot a full length if the subject is proprerly weighted.
I thought she did pretty good with this girl.
Here is a shot at the beginning where she didnt know what to do to get the bride to look her best:
Im trying to shrink these images, but maybe bigger will be more helpful...
Shrunk em...