Sorry this is long. Footed zipper pjs , put on backwards zipper in the back you can cut the feet off of the pj's . Add a diaper or safety pin if he can still get the pj's off. Always double sheet the bed along with a water proof pad between. From birth I double sheeted the bed so if anything happened in the middle of the night I only had to take the first layer off and the bed was made I could do this with one hand have the baby in the other and back to sleep every one went. well I had to make a stop in the laundry room and start a load. Good luck.
As far as potty training he may be ready if he can,Just look for a general trend toward independence and an understanding of what it means to go to the bathroom like a grown-up.
Physical signs
Is coordinated enough to walk, and even run, steadily.
Urinates a fair amount at one time.
Has regular, well-formed bowel movements at relatively predictable times.
Has "dry" periods of at least three or four hours, which shows that his bladder muscles are developed enough to hold urine.
Behavioral signs
Can sit down quietly in one position for two to five minutes.
Can pull his pants up and down.
Dislikes the feeling of wearing a wet or dirty diaper.
Shows interest in others' bathroom habits (wants to watch you go to the bathroom or wear underwear).
Gives a physical or verbal sign when he's having a bowel movement such as grunting, squatting, or telling you.
Demonstrates a desire for independence.
Takes pride in his accomplishments.
Isn't resistant to learning to use the toilet.
Is in a generally cooperative stage, not a negative or contrary one.
Cognitive signs
Can follow simple instructions, such as "go get the toy."
Understands the value of putting things where they belong.
Has words for urine and stool.