dude you are not doing any favour to Him by offering prayers :d Allah doesnt need your prayers! Its just that He wants to see who among us is dutiful and who is not. This life is a test for us. If you dont go to mosque or offer your prayers, believe me, He couldnt care any less for that. He doesnt need any favours from us!
speaking of Hidayat (the right path), so to let you know He only gives Hidayat to those who seek Hidayat. Have you heard of free will? He infused this thing called Free Will into us and left us on our own to decide our own fate.
In other words, when we offer prayers, hum Uss par koi ihsan nahin karte..if you cannot dress up appropriately, simply do not bother offering prayers at all as we are not doing any sort of favour to Him.