They are different knits — check the reverse side. French terry has a smooth knit face and visible loops on the reverse; that looped construction is behind its mid-weight, breathable hand. Single jersey is the familiar T-shirt knit, and its face and reverse look different from each other. At The Fabric Lot, French terry runs 300 GSM ($16.80 per yard, 60 inches wide, 100% cotton) and 450 GSM ($21.00 per yard), while cotton jersey starts at $7.20 per yard in the collection, with a 200 GSM jersey and matching rib at $11.55 per yard. Pick terry for hoodies and joggers, jersey for tees and basics — and a $7.20 swatch settles the hand before you buy.
Read the full guide: French Terry vs. Fleece vs. Jersey: Which Knit Should You Choose?