I wear a lot of jeans, etc. at home, but during the summer I have to dress up a bit for an internship. It's a three hour drive, so I stay there for the week, and don't like to pack a lot. My hacks:

- Find something that fits? Buy more than one. Anyone with a non-optimal body type/size will recognize the pure joy of find a pair of dress pants or blouse that fits beautifully. I buy bottoms in neutral colours and tops in a mix of neutrals and fun colours.
- Buy comfortable, yet somewhat stylish shoes, in a neutral colour. I tend to wear the same pair of shoes day in/day out for work. I might occasionally throw in a pair of sandals for a fun Friday, but that's about it. And I refuse to buy cheap (non-leather) shoes anymore. It's just not worth it. They don't look good for long, they don't let your feet breathe, and they're uncomfortable.
- Minimal jewelry. In fact, the only time I change my jewelry is when I'm dressing up for a special occasion.