"Pakaianmu tidak sesuai" can be meant as: "Cara berpakaian Anda tidak pantas". In English, it'll be "Too Showy", "Too Open, Not Covering some Part of our Body enough", "Too Tight, The Curves of the Body are Visible", "Baywatch", and so on. I couldn't explain this further.
The sentence can also be meant, for example, it's said by our parents when everyone wears neat-clean or formal clothes in some events while we use only old or kasual clothes. Our clothes have covered our body, but are unlike the others, or not worth enough compared to others.