After Sabine hit a growth spurt she has been having to adjust her clothing and armour to fit her growing and elongating body. She has mostly been successful but unfortunately her boots are a size or two too small for her very large feet. After a long day of trying to defeat the Empire, Sabine sat herself down and took off her left boot. Her foot was in agony and she knew that she couldn't wear these boots anymore. Making new ones that fitted her much larger feet was essentially as she didn't think that she could defeat the Empire while she was bare foot.
https://www.deviantart.com/a0040pc/a...Foot-762386910