ClarksWomen's Arla Glison Flip Flop

Whats the difference between offered colors black fabric and black?

What is the difference between the offered colors "black fabric" and "black?"

I usually wear a 7 or 7 1/2. Are these very fitted to the foot? Not sure whether to order a 7 or 8.

Can you tighten the straps? They feel so loose and a lot of space between the sandal and my foot when I walk.