DIY Denim Trench Coat Using Simplicity #9389
Hi, Darlings! I was gearing up to take a break until after Christmas but I got this huge burst of sewjo and so I have been sewing a lot. This DIY Denim Trench Coat Using Simplicity #9389 is a big hit already on Instagram, lol. I love this jacket so much. It was certainly a labor of love because if you have ever worked with denim and topstitching you know it can be labor intensive. I was inspired by a denim jacket I saw on Pinterest so I grabbed some fabric from Melanatedfabrics.com and got to work. Pattern and fabric details are below.
FABRIC USED for my DIY Denim Trench Coat
This is the DENIM BLUE from Melanated Fabrics and it is beautiful. 10 oz denim and 100% cotton. Make sure to wash your denim before cutting to avoid shrinking after the fact.
PATTERN USED
This is one of the patterns that my hubby designed for my Mens patterns with Simplicity and it is so good. I used the size 40 for an oversized look without it being too big. The pattern is currently on sale at simplicity.com for $5.99.
CHANGES I MADE
I added a pleat to the back vent, made the collar wider by 1/2", and I also squared off and lengthened the storm flap. I made the epaulettes wider too. The ties at the sleeves were great as is but I wanted them long and to wrap around my wrist so I made them a bit wider and longer.


















I absolutely love how this turned out! Widening the storm flap and adding that pleat to the back vent made such a massive difference to the overall silhouette—it gives it that classic store-bought look while still keeping it distinct. Topstitching 10 oz denim definitely takes patience, but the finish is so worth the effort. Lately, between tackling complex research for my International Law Assignment Help Australia coursework and spending hours at my desk, looking at creative DIY projects like this is the best way to unwind. Did you end up using a specialized heavy-duty needle for all those thick layers around the collar, or did a standard denim needle handle it fine?
That 10 oz denim from Melanated Fabrics turned out fantastic, but standard topstitching on heavy cotton can definitely test your patience! I really liked how you modified the sleeve ties to make them longer so they wrap around the wrist it gives the trench such a relaxed yet tailored look. Finding time to focus on complex projects like this is always a challenge when balancing work and study; even managing a heavy workload with the Best Assignment Help Australia available leaves me wishing for more creative downtime. I’ve been considering trying out this Simplicity pattern for an oversized autumn piece myself. Do you find doubling up on topstitching thread makes a big difference with 100% cotton denim?
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Love this denim trench coat! The topstitching looks like a lot of work. By the way, if you ever have mouse issues while browsing sewing tutorials, I found a handy mouse tester online that checks buttons and scroll without installing anything.