Ngl, oversized and baggy clothes are the bomb lol. Dude, I was with the dudes, and I always wear baggy clothes, and they were so surprised when I wore a tight outfit XDXD They were just like "oh dang, so that's what's under there." XD But yes, I love baggy clothes, they are just so much more comfortable!!
Personally, I'm also into the "Surfer Crush" aesthetic- lots of washed colors, waves, surfboards, and shells!!
You're lucky you get to actually go shopping lol. I can't afford it. I hope you have so much fun!!
Best of luck!! :)