A consideration of the casual

The term "casual", while being subjective in nature, is, nonetheless, defined by the culture in which it is understood or considered.  That is to say, the term may have different meanings depending upon the time or place it is used.  What is casual at any one particular time or place may not be casual in another.
While this is true, this does not remove the concept of appropriate.  The term "appropriate" too is context defined.  This leads to my point.  When is casual attire appropriate? 
As we stand in church, even a brief glance around reveals that many people believe that casual is appropriate.  I am not talking about the visitor.  I am not talking about the newly converted.  What does our insistence that flip flops, Hawaiian shirts and tank tops are acceptable in church, tell us about our view of God?
We can all think of situations where one particular outfit would be appropriate but not in another.  Why is this?  Are we concerned about communicating the wrong message to others?  Are we concerned about insulting or offending those in authority?  What does casual then say about how we view God and communion with him?
There is nothing more important or special than our relationship with God.  Imagine going out to an anniversary dinner with our spouse but we haven't showered or changed out of our work clothes.  Imagine becoming intimate under those same circumstances.  It is unthinkable.  The Divine Liturgy is the closest, most intimate moment we have with God.  Do we approach it so casually?
The opposite side of this thought is no better though.  We ought not approach the Liturgy with vanity either.  We partake of the body and blood of Christ humbly and with fear, not with thoughts of our own glory and excellence.  We ought never "dress to impress" at church either.
The short of it is this.  We come before God realizing that we are entering the very presence of God himself, to commune with him, something the faithful longed for, prior to the death and resurrection of Jesus.  We have nothing to give him but our love.  Our sins make us repulsive, but the grace of God makes us clean.  Our fancy dress won't impress him, but our lack of attention and our casual demeanor may offend him.
It's worth considering.