Surgery Tomorrow and i should buy compression vest

[rimo301]

So , my surgery is tomorrow , i am not afraid at all .
so my doctor told me not to eat for 7 hours before the surgery ... and to shave my chest hair and other close parts , because of the surgery

he also told me i will have drains for about 7 or 8 days .

So he told me that i should buy a compression vest,  and actually i don't know , should it be too tight , or not so tight ?? i don't to buy a compression vest who isn't good

Sorry for my weak english