I feel like shopping online has helped my fashion sense. Before I would just walk into a store, try on the first thing that look agreeable, and if it fit I'd buy it and leave. Mostly I just wanted to get in and out. But most online retailers have lookbooks and recommendations. You get a better idea of what clothes look good with other clothes. Plus because you're in the comfort of your own home, you can take as much time you want deciding what you think looks best. Also the simple act of browsing clothes becomes a lot easier/faster. Rather than rummaging through a store you're just scrolling down a page. You can literally glance through hundreds of styles in a matter of minutes.