Canvas Web Belt D-Ring Buckle 1.25" Wide Metal Tip Multi-Color

I am between a 34 and 36, depending on the cut of the pants/shorts. I have an athletic butt; waist is closer to 33/34. What size is best?

The navy and cream striped belt looks like navy and pale blue in the photo. Could you please clarify this?

Es elastizado

How do you buckle it?