FlexfitTwo-Tone Stretch Mesh Fitted Cap Hat

Does this hat cover up to and including a size 8?

Is navy with grey mesh availiable in this style cap?

I want to buy this cap.( Size: One Size | Color: Black/ White/ Black) but jwhat is the real measure. which means one size...? its S or M or L...?

Is it easy to sew patches onto it? I love that it's a blank canvas to do what you want with, but I'd want to add patches of some sort.