Yes my wife.
A few times whilst on holiday I have tickled her exposed arches when she is wearing the black gladiator style sandal. She always flinches and pulls her foot away, but if I tickle her enough she will giggle. She tries not to whilst in public.
Also I will repost this tale:
A few years ago me and my then gf were on a train together, it was a short distance suburban rail line and as such, had seats facing each other as well as facing sideways.
It was a warm sunny day and my gf was wearing her white easy access sandals as I call them. The T Bar type that straps across the ankle.
The train was about to depart and we had both sat down. My gf who i'll call Xu, was sat opposite me with her easy accessable size 4 medium arched feet on the floor beneath me, due to the short distance between the facing seats.
I picked up her right foot with my thumb on her bare sole and fingers on the top of her foot. What I love about these sandals is how easy it is to not only tickle her foot but to be able touch 99% of her foot. The sandal is always loose as well when the foot is not leaning on it which gives me room to touch underneath.
I just find something sexy about being able to touch a woman's foot through her sandals.
As the sandal was loose I began massaging her arch with my thumb and I made sure to play with and rub her toes too.
Two men were sat to the left of our seats, they were talking in Arabic and I noticed when I started rubbing her foot they stopped.
Then they took one look at each other and watched what I was doing for a moment, I get the impression they said to each other, hmmm those two are clearly enjoying that.
When Xu least expected it I wiggled my finger up and down her foot, she flinched and grinned then I went back to massaging her foot.
A few seconds later I tickled her arch again, causing her to flinch and grin.
This went on for a few mins until we reached our station, I even tickled her toes at one point.