I'm scared my deen is slipping because of clothing choices

Ever since I was younger, I've been into style, but I usually kept it modest-like streetwear-because having a larger chest makes fitted tops uncomfortable for me. Yesterday, though, I tried on and bought a top that was tighter than usual. My mom got really upset and said it was too revealing. At first, I didn't think it was that bad, but now I see she was right. I feel so guilty and almost like I don't recognize myself anymore. I'm praying that, insha'Allah, I don't let fashion weaken my iman. Please make dua for me.