Bobby pins to tailor clothes are for mannequins only
According to the blog Man Repeller, bobby pins are ideal for reducing sleeves, slacks, and shirts. The bobby pin hack for clothing may allow you to wear clothes that are a size larger than you desire. After putting on an item of clothing, you simply fold it to your desired length or fit. To keep it in place, you use a bobby pin.
This may work on mannequins, but it won’t work on you because you’re an active human who moves around all day. When you move, the bobby pins will shift and even come out, so you can’t keep correcting them all day without getting upset or even hurt.