I would get a rattan chair in a natural color like your table is and choose a color for your chair seat and back from one of the colors in your pillow on right side of sofa. I think maybe using the same color as your chair, then put a lengthwise folded throw in red on back of chair to pull colors together. The rattan chair will give you great texture without trying to match style of chair you already have. I hope this helps you.

Thank you! Makes sense to go with rattan!!

Yes, great idea of rattan or even just some kind of open type chair. I do love your other furnishings and the throw. I think the gray chair is quite heavy, so an airy type would work well. Also, the style of the throw would work well with rattan or other wood chair. Perfect! Good Luck!