Secret Sewing tip:
**never think you will save time by not pinning the fabric. You will not save time, you will sew the onesie to itself and have to unpick.
Secret Sewing Tip:
If you try to unpick thin double knit onesies, you will just make holes. The fabric is ruined and you must start over with a new onsie. So avoid having to unpick.
I got the idea and shoe pattern here:
And the onsie tutorial here:
This one looks good too: