Yes there is a difference in what you wear in church. For example, women should not wear short skirts or dresses with low clevage dresses; this makes you look like a slut and it brings attention to herself. Ladies should dress like a lady and not like a slut in church.
Now fellas, be dressy but not a bum or pimp.
If you dress in suit look nice but be clean.
Clothes have a purpose and if not enough, it can be a distraction. If too much, a distraction. Any variety of wear can be a distraction from the purpose of honoring, worshipping and praising God with the ekklesia. Nevertheless, we do need to focus our attention as to why we are there and let the leadership and God bring and encourage conformity with the person in question. Let see her or him as a family member and love them the same. As family, we do not compare the world because they are in God's family and ours. Let love carry the day and pray ye one for another and the lord by his Spirit will bring the appropriate correction. Prayer and love is a dynamic duo. Love them anyway and let the focus be on their souls, their spirit and their spiritual growth. Love wins out. Thus we please God. thank you.