^ Randomkoreandude is the man.
I suggest you to go with the same size of Polo, I've read many times to size up but from my experience this isn't the best advice.
The gap between size is huge, go with same size of PRL in shirts, pants, and outerwear.
I have not tried sweater so I can't talk about them.
I bought that ocdb no logo in spring sale and they went on sale, last year every jackets, pants etc. was on sale, this sale WTF happened!?
By the way the cords are on sale, good, I would try also the slim jeans considering their cheap price, I should order the same size of chinos or size up?
Thanks in advance