Those between chapter drawings are usually made long after the chapter is done and published in the magazine, when it's time to make material for the collected tankobon. Likely the artist or author didn't think anything of the clothing problem while making the chapter and only realized/was told about it after.So he's just walking around in there with his shoes on? No gloves or goggle or any other type of protective equipment?
EDIT: He justifies it in the next chapter. I still think it's dumb.