Size & Fit Guide

Sizing - Fit Guide

Please use the Night & Day Swim size guides as an estimate as to what size to purchase, as styles, sizes and cuts vary between each individual item and may not be consistent with the size guide measurements.

Our swim bottoms range in coverage from cheeky, all the way up to full.

If you are unsure & require further assistance regarding your sizes and measurements, please contact our customer service team at We are more than happy to help you. 

Please refer to the details of individual items for sizing notes. All Night & Day Swim garments are physically labeled with US sizing labels, unless stated otherwise.


Swim Fit Breakdown

Our sizes run in five standard sizes.
Extra Small, Small, Medium, Large & Extra Large.

All pieces are standard sizing unless advised on the item description. Please read all garment item descriptions online to avoid ordering the wrong size.

Seamless finishes give a stretchy feel and if you think you are between sizes we recommend sizing up for the most comfortable fit.

Due to our minimal cut and coverage style we suggest larger busts going up one size to your normal t-shirt size unless you are comfortable with minimal coverage.

Please note XL sizes are slowly being introduced into our stock so any questions regarding these sizes please contact our customer service team. If you do not see a selected style in the extended size please contact our customer service team to be advised for a possible alternate.

Size chart