Item description for Size 6 Months Sir John Yellow White Checked Jon Jon Romper Shortalls Goose Used

Sir John
Inside tag is very faint but a 6 is still visible. Assuming this is a Size 6 Months
Measures approx. 17" shoulder to hem, center neckline to crotch 10", flat chest 11"
Yellow and White Checked Pattern
Goose embroidered on front, bottom right leg
Buttons at the shoulders
Snaps between the legs
Completely lined in white
No rips or tears
There is an ink marking on front left side about 5" from bottom. I have tried to remove the marking without success. The marking is faded, but I have not been able to remove it.
Smoke free home