Note: I'm only gonna write about female fashion as I'm a girl. If you really want to see my opinion on male fashion, comment below and I'll do essentials for them too. Also, I know there's much more to it, especially because I haven't covered every season and weather.
Jeans are probably most popular fashion item. From really light colors to black ones, they are making their appearance everywhere. They can be used as casual, but also as more elegant look. I would suggest getting regular blue denim color or black ones. There are also so many styles that everyone can find one to fit them.
Some other things I would suggest having:
- sweaters - because cold weather
- blazers - they can easily turn boring outfit into something elegant and professional
- cardigans - they can be thrown over T-shirt to complete the look during cold days
- shorts - cause it's not always that cold outside
- fancy pants - because you just might go to some gala during winter