I have EVERY color of the Cleo's (much to DH's dislike). They are the best! I wore them at WDW last spring and all summer long. I usually wear an 8 1/2, but wear the 9, due to the length also. I also have a very high instep and keep trying on the Patra's, but they don't stretch like the Cleo's do. I pull on the bigger strap carefully, just like they say to do for the regular crocs.
I usually where a size 8 1/2 in closed shoes and an 8 in sandals I don't like a lot of extra space in length in a sandal, I'm mostly concerned with tightness in the straps but I guess I could stretch them a little. Crocs has another new style that are like the cleos but the strap is criss cross, they are very cute. I've only seen them on crocs.com. Linda