How Your Footwear Should Fit
Mid 19th Century footwear has a long tapered toe. You should have at least a thumb's breadth of room in front of your big toe. From the outside your shoes or boots will look longer than they really are on the inside. As you wear your shoes or boots they will shorten in length. This is normal for mid-19th century footwear.
Boots, shoe and bootees can slip on the heel when new. As they are worn they will "set" to your foot and the slipping decrease. Wearing your new footwear a few hours a day around your home before taking into the field will allow them to set to your feet allowing for a better first field use experience.