Help wise MNers. DP is 40, tall, lanky and dresses almost exclusively in surf / skate type brands, so pretty casual.
He's got one suit & 2 nice shirts but other than that it's slim cut jeans / chinos / T-shirts with surf brand logos / jumpers.
I don't mind what he wears as long as he's happy and comfy, but his style leads to him fussing a bit when we're going out for dinner or drinks and I wear something he considers fancy (a dress), that he looks scruffy in comparison.
He asks me for advice but I've absolutely no idea what Men of this age are wearing these days, or where to look even? His friends are all either even more casual than him or very preppy smart (think v-neck jumpers over formal shirts) which is definitely not DP.