Tired As A Mother T-Shirt Sizing These are unisex shirts and a good rule of thumb for women is to size down for a regular fit. Order your regular size for a more loose fit. Go up a size to make it over that baby bump! Processing and Shipping Processing time is usually 1-3 days. This may take longer during busy times and holidays (rare). All shirts are sealed in a waterproof barrier before being placed into packaging to make sure the weather wont hurt it.