Just as you are free to walk around wearing ragged tank tops with a tux, or bras on top of your shirts, you are free to wear anything, any way you want in this modern liberating world of mode, as long as there is no specific dress code for your specific event.
That said, yukata is summer wear, so precisely speaking, it's considered odd to wear it in April or May. In other words, if the climate allows cherry blossoms to bloom, then yukata just cannot be together. You will be too cold anyway.
When wearing it during your proper June to September season (granted it's in the Northern hemisphere), since it is summer wear, you are expected to wear no socks or tabi.
Getta or setta is the only proper footwear I can think of to be worn with yukata.
Datejime is something a woman wears as part of their under-supporter. It's not something to show and it's not for men.
But again, you can wear anything you want. And just as it is with Western clothing, experts on kimono say that it's important to
know what you're doing.
In other words, you should
know that it's not proper for men to wear datejime or subber sandals with yukata, and you should
know you are wearing them as part of your own and unique fashion. But as long as you know your mode, anything goes.
But frankly, I think jimbei will be too cold too.
https://www.google.co.jp/search?q=%E8%8A%B1%E8%A6%8B%E3%81%A8%E7%94%B7...