Sorry guys! Meant to reply but got distracted.

Yes, you can bf in them. The zip doesn't go down so far, but the straps are kind of stretchy, so you can put the top of the top down a little. I've never had any problem feeding in them.

And i got a size 18.

I like the cotton better. They are longer (like reach over your hips, not above your midrift), but the lycra does dry quicker.