Going up two sizes for a looser fit, the size runs a little small, so we recommend ordering one size up for a regular fit. Very disappointing as they were bought for the family's Christmas pajamas and didn't make it to Christmas morning. The pants look good and the fabric isn't terrible but they aren't made very well as the seams are sewn so poorly. I would not recommend them based on my experience with them as they were disappointing and a waste of money. For those waiting to order - I hope I just received a faulty pair as my husband's pair survived! He also found that the dimensions are small.