Even for daycare standards, which are generally crazy stringent and err on the super side of caution....14 mos is beyond what we have to follow, so you are golden to do what you feel comfortable with. But I wouldn't fix what isn't broken I guess? Altho I have many daycare children who potty train at 22-24 mos, so a sleep sack being gone well before then would be needed (they need to be able to get up and go potty on their own 2 feet!). But you still have time!
For us, here in MN, in home daycare, up to the DAY OF the first birthday, we can not have ANYTHING but the child in the bed (approved sleeping bed, which is changing with all the new crib standards..we are being told pack and plays are the next wave...time will tell and many providers are nervous about that!). SO no bumpers, no pillows, no lovey's, no blankets. Sheets must be very tight fitting, no slack at all. They approve and support the idea of a sleep sac for chilly rooms (sleeveless sacks, not blanket sleepers). This is ALL due to SIDS standards here in our state.
This is something that changes every few years, so for most of us, the standard we were "told" will be different depending on how old our kids are! My own is 17 years old and always had at least a lovely recieving blanket and a cover blanket. She covered her face from day one with that thin blanket (scared the crud out of me!), then at 2 years old was given her "horsey blankie" and STILL sleeps with that thin as heck threadbare thing under her pillow! She is a blanket kid and like another said, even at 2 years old in her toddler bed, had so much stuff in there, I am not sure how she fit in the little nest?? She survived. But the standards (at least for home childcare, and the warnings that exist) are there because of the kids that didn't survive and trying to do everyting you can to reduce the chance of that I guess.
Parents can do what they want. The guidelines are there to guide.