For a modern casual outfit without the need to sacrifice on practicality, we like this combination of a long sleeve t-shirt and light blue ripped skinny jeans. For a more refined aesthetic, complement this ensemble with a pair of white high top sneakers. This combination is our idea of perfection for when temps are getting lower and autumn is in full swing. Those who wonder how to pull off modern casual dressing as you progress through your 20s, this combo should answer your question.