It says that you step into it. Does that mean I have to take the whole thing off when I need to use the bathroom?
Our cami is just a top, this is just a top part of shapewear and it is not connected to a bottom, so it will not be difficult if you need to go to the bathroom.
Are they true to size?! I wear a 40D bra and size 14 pants... sometimes a 12 depending on fit... should I go with a L or XL?
Sizing can definitely be tricky at times, but it’s actually pretty easy! Just to make sure you saw it, the best place to start is with the measurements from the size chart on the product page. Right above the “Size” button, you’ll see a “view size chart” link or check the table "Confirm Your Size" in the product description.
Then measure yourself and use that to choose your size. I should also mention that, like many shapers, these tend to run small. Most people intend for them to be on the tighter side. If you're not comfortable with that or you're between sizes, I might suggest you go a size up.
Is this comfortable enough to wear everyday all day?
Yes. I work ten hours a day at a computer and find it very comfortable. Many other bras cause the anxiety of needing to adjust throughout the day. My back has many issues and dome days nothing helps. Have found this to be the best for long term wear.