The current view is that while God looks at the heart, man looks at the outward appearance, so that needs to be taken into account so that the right impression is reached by the audience being addressed.
The current view? What does that mean? God's current view? Jesus' current view?
When Jesus ate with sinners, who's view was important then? The view of the Pharisees to whom outward appearance was important (and remember, Jesus called them whitewashed graves, ie. it's what's inside that counts)?
If our interest is in pleasing men or in looking good before men then yes, wearing a business suit when we worship God would be very important.
A couple of verses to consider;
Matt 4: 18 Walking alongside the sea of Gal´i·lee he saw two brothers, Simon who is called Peter and Andrew his brother, letting down a fishing net into the sea, for they were fishers. 19 And he said to them: “Come after me, and I will make YOU fishers of men.”
- Did Jesus expect these guys to go off and get changed, bring their appearance up to a certain standard that would be socially acceptable to onlookers?
Isaiah 55: 1 Hey there, all YOU thirsty ones! Come to the water. And the ones that have no money! Come, buy and eat. Yes, come, buy wine and milk even without money and without price.
- The invitation is to come. There's no caveat that first you'd have to dress or groom according to a certain standard.
It seems you're happy to concede that Jesus doesn't judge from outward appearances. Shouldn't that be enough for us? Why add to that truth by stating that, actually, it's how we look to outsiders that matters. If it doesn't matter to Jesus......