I don't think the amount of fabric in Ola's costume has anything to do with how good a dance or her partner's dancing is either.
She just loves wearing revealing costumes and why not? She has the most fantastic figure and they show off the movement of her body as she dances and add to the enjoyment of the dance.
If you watch DWTS you will know that nearly all, if not all the female pros on that show wear the same kind of costumes that Ola chooses.
Erin looked fabulous last night and so has Kristina since she first joined SCD. The new pros are also more adventurous with their costumes - Katya and her bum comes to mind!
We are just not used to it on SCD, but that could be more to do with the age and body shapes of the pros we've had until now than anything else.