High school student interested in dress clothes?

Hey guys, I'm a high school student and I been really interested in clothes. A club at my school required me to wear dress clothes and ever since I been hooked. I just wanted to know if I should invest more in dress clothes or just contiue buying normal clothes. So far I have a dark blue and raisin J.J Ferrar slim fit dress shirt, one dark purple 1MX (hahaha), and finally two J.J Ferrar slim fit flat fronts. I just wanted to learn from you experienced guys. Thanks :)

Thanks so much :D