From Kill Ten Rats:
Let’s talk equipment. You will not be wearing anything on your shoulders, nor a cape, nor a tabard. Leave the sword at home, too, no matter how cool it looks. While some people can successfully combine mix-and-match armor, you will just end up hideous and ineffective. If your closet is full of t-shirts from anime and They Might Be Giants, we have a problem. Luckily, there are many shopkeepers who can help you get equipment with the right bonuses.
This may cost a fair number of gold pieces. Luckily, you will not be out-leveling your IRL clothing anytime soon unless you are eating too much. This brings us to our next point: buffing.
Always remember, never act on anything you learned in a dating sim.