When in business, have the equipment and style to do business!
One of the most basic requirement for a business man is to have a professional business wallet - Preferably one that is reasonable small and really stand out from the crowd.
Based on my experience way to many people walks around with their big wallets either in their trouser pockets or in there inner jacket pocket – however very few wallets (well I have never seen any) are small enough not to look bulky in a suit pocket and besides that they ruin the suit.
One option is to have a small very thin credit card holder in your suit, which can take 2-3 cards+ a few folded notes – then keep the wallet in your bag, suitcase or office in case it’s required. When you get used to a credit card holder you will realize how much (or rather how little you actually need most of the stuff in your wallet!)