How to afford designer items when in a college?

I’m turning 19 on the 19th of May and I’m so excited. I’m in Upper secondary school (Gymnasia) and I’m due to graduate summer of next year which I’m very excited about. After graduation I plan on finding a good job and travelling the world and working hard for all the things I desire.
I currently have a part-time job with school where I work every other weekend and two weekdays. I don’t love the job but it’s saved me for a whole year from asking my parents for money.
As of now, I’ve got like 3 weeks remaining of school and I have been applying for summer jobs and I’m just waiting for responses. I hope to find a good paying job that I will also enjoy and hopefully I can continue working there even when school starts again next semester.

This summer I will be travelling to Milan, Italy and I cannot wait since it’s the place for fashion and as I am a huge fashion lover I’m very excited to explore all the designer stores and all that. Also Iceland’s very expensive so I plan on doing a lot of shopping once I am out there. I really want a LV handbag or a Prada wallet and I’ve been drooling over them on the official webpages. Although I’m wondering, if any of you have designer items in your closet, how did you afford it and what is your opinion on designer clothing and such.

And with the job that I have, how can I save more money because I seem to be having troubles with that.