I think there are 4 points that we need to consider, especially in the African context.
1. Suits and Ties, "Sunday Best" are very western concept and are at no point alluded to in the bible.
2. We are not to lead one another into sin: if you are meeting with your brothers and sisters you should honestly examine your heart with regards to your attire. Does it sexualise you, does it draw attention to certain features that may cause someone else to be, lets call it "distracted" lol
3. If you are a Christian then you believe God is with you all the time. He sees you even when you wake up in the morning with a crusty face and He loves you anyway. Be about your Father's business not only on Sabbath or on Sunday. 
4. Disclaimer- Personal opinion: I think this debate is the residual fruit of colonialism. Why are so many types of churches in Africa required to go as far as wearing a uniform? These are not matters of salvation. It can almost cause you to idolize attainment of positions and levels of status in the church unconsciously because the "church's system" requires you to do that. It breeds pride in physical things and detracts from focus on spiritual growth. 

So I say, be comfortable in your Father's house, dress up or dress down but before you walk out that door exam yourself and be content with what you see and your own intent.