Let first find the purchase price (cost) of 2 pair of pants, 3 dress shirts, and 1 suit jacket.
2 pants = 

3 dress shirts = 

1 suit jacket = 

Summing all these, we have 

Harold marks up 27% of his cost. So we add 27% of 617 to 617.

Hence, Harold charges $783.59 to his customer who will buy 2 pants, 3 shirts, and 1 suit jacket.
ANSWER: $783.59