You don’t knot sarong, you wrap it around you and then fold the top edge down a couple of times. It’s much more secure and comfortable that way. The sarongs I have are in more “manly” colours. Black/blue, brown/tan, dark purple/ochre - those have floral and tribal motifs. Then I have a couple that are brown with multicoloured lizards on them. Generally I wear them with short sleeved button up shirts. I’ve never ever gotten a negative comment or a weird look (not that I notice looks much). On contrary, I’ve had a few compliments and a couple of guys saying “I’d walk around in a sarong all the time but my wife won’t let me.”