The clothes available in Grand Theft Auto 4 are just one part of the gameplay. There are some differences in clothing between GTA3 and GTA4 as well as how Niko interacts with them and they are explained below.

As in previous Grand Theft Auto titles, the main character Niko Bellic can buy different clothes throughout the game. Some of the choices are personal preference, while others are required to complete certain missions. This page give you information about the various clothing options available including casual clothes, dress clothes and more.

In Grand Theft Auto: San Andreas, purchasing clothes involved walking into a magical changing room and waiting patiently for the textures to load. In GTA IV, Niko can browse through the store, try on anything on display, and either purchase it or continue on to the next aisle.http://gta.wikia.com/Clothing_in_GTA_IV

In Grand Theft Auto IV, the way Niko dresses can have a positive or negative effect on other people's perception of him.Eurogamer: Grand Theft Auto IV Review For example, dressing poorly for a date will leave his companion with a bad impression. The clothes and accessories available in the game can be categorized in hats, glasses, tops, pants and shoes.

Some missions, such as Final Interview, require Niko to dress a certain way. The gameplay of other missions can change depending on how Niko is dressed. For example, in the mission Flatline, Niko needs to assassinate a patient in Westside Memorial Hospital. He can steal some hospital scrubs to complete the mission stealthily or he can charge in with guns blazing.http://gta.wikia.com/Clothing_in_GTA_IV