It's a guessing game when purchasing online.  While the elastic does stretch, I don't think a small is going to feel comfortable with a 36" waist, though the sizing chart indicates that's the max stretch.  I'm about 28" depending on where I measure and I definitely feel the squeeze.  It will expand to a larger size, but it won't fit comfortably.  The last medium slip I ordered, though, has to be gathered in because it slips off (ha!) my hips.  If you're a 28 or bigger, I'd skip the small.

The slip comes turned inside out so the first thing you'll want to do is flip it outside out.  To fluff it I held the bottom layer and flipped the slip upside down, letting the top layer fall free and spread out.  Then I laid it on the floor and spread both layers out.  Lastly I gave it a few bounces while holding it by the elastic.  Those steps seemed to fluff it up nicely.  I'm still not entirely sure how to wear this thing - it looks cute on everyone else who's posted pictures, but on me it looks silly peeking out from the dress.  Maybe it's the socks.  It seems to need ironing so that's the next item to figure out.  Perhaps ironing both the dress and the slip / petticoat will help.

In any event, there was a definite difference between no flouncy fluffy slip and having a flouncy fluffy slip.  Someone said they wore two of these things - I can't even imagine!  I would feel like I was hiding a dandelion under my skirt!  One of these should do fine for lightweight material such as the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/DRESSTELLS-1950s-Retro-Audrey-Swing-Pinup-Rockabilly-Dress-Pleated-Vintage-Dress-Coral-S/dp/B01L6FJW1U/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">DRESSTELLS 1950s Retro Audrey Swing Pinup Rockabilly Dress Pleated Vintage Dress Coral S</a>