Other operators with special formats accept more than two operands. If an operator is given a null operand, the result is always null. The only operator that does not follow this rule is concatenation (||).
with any alterations the most important thing is your tailor be sure to find an experienced tailor who you can trust if you are in need of the basic alterations hemming pants for length or taking in the waist your dry cleaner can probably help if you need anything more advanced definitely go to a real tailor more in this series
I have trouble sewing zippers on stretchy stuff. They tend to pucker. Zippers on bodysuits can be a bit tricky, but the key here is to not stretch the fabric as you sew it to the zipper. This can easily happen as you run it through your machine because sewing feet push the fabric along, and can distort it.