I don’t usually buy clothes online, but in the case of the Levis Signature Authentics, I previously had five or six pairs from Target that fit me just fine. The ones I bought online were okay but just a little big. If I had gone down a size they would’ve been too small, so I just went with it. By the time I get around to buying more, the sizing will probably have changed again (and I will probably have gained a pound or two)