The issue came to light after a picture, in which Lord Swaminarayan can be seen donning the Sangh outfit--white shirt tucked into a baggy khaki shorts with black cap and black shoes on--went viral on various social media platforms.
The idol is also seen holding the national flag in one hand.
According to Swami Vishwaprakashji of the temple, which is situated in Laskana area of Surat, the dress was gifted by a local devotee a few days back.
Even as the temple authorities denied having any intention of endorsing the views of the right-wing organisation, Congress condemned the move.
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Senior Congress leader Shankersinh Vaghela said temple authorities must refrain from such activities.
"What do you want to prove by dressing up the god in khaki shorts? I pity those who have done that. Today, you have dressed the Lord in RSS uniform, tomorrow you will dress the idol in BJP's uniform. This is very unfortunate," Vaghela said.
"I am really surprised! If at all it was done, I don't approve of it," said Rupani.