First Manufacturing Leather Jacket Sizing: Every Jacket Has Its Own Chart

First Manufacturing (First MFG) makes leather jackets and vests for cruiser and touring riders, and it's one of the biggest brands in our deal feed. The catch for sizing: First MFG says every product has its own size chart, and the charts we checked really do put the same rider in different sizes. Below are the official charts from six First MFG product pages, how First MFG says to measure, and what each page says about fit.

The short version

Use the chart on the exact jacket's page. Every First MFG page we checked says: "Each product from First MFG comes with its own unique size chart." [1]–[6]
Measure chest and stomach, then use the bigger number. First MFG: "Measure your chest in inches (or your stomach if it is larger) and use the larger measurement when referring to the size chart." [1]–[6]
Same chest, different letter. A 42 in body chest is an L on the Raider chart, an M on the Fillmore and Commuter charts, and an M on the Hammer Down vest chart [1][2][3][4].
Fit notes point both ways. The Raider page says most riders size up one [1]. The Commuter page says it runs ½ to 1 size large [3].
Between sizes? The Electra, Biker and Hammer Down pages say "Between sizes? Go one size up." [4][5][6] Every page's FAQ suggests Made To Measure or a call [1]–[6].

How First MFG says to measure

Measurement	First MFG's instruction
Chest	Around the fullest part of your chest, under the arms, tape level.
Stomach	Around the widest point. Use it instead of chest if it's the larger number.

The pages' "Find my size" tool asks for "your chest or stomach, whichever is bigger" measured "over a T-shirt", and how you like it to fit (Snug: T-shirt only, Regular: hoodie under, Roomy: heavy layers) [1]. The charts also list garment chest, garment waist, back length, sleeve length and (on most) across-shoulder; we show the body rows here because those are what you compare your tape to. Our measuring guide and printable tape can help.

Men's jackets

Raider (men's leather jacket)

Size	Chest (body, in)	Waist (body, in)
S	36–37.5	31–32.5
M	38.5–40	33.5–35
L	41–42.5	36–37.5
XL	43.5–45	38.5–40
2XL	46–47.5	41–42.5
3XL	48.5–50	43.5–45
4XL	51–52.5	46–47.5
5XL	53.5–55	48.5–50
6XL	56–57.5	51–52.5
7XL	58.5–60	53.5–55
8XL	61–62.5	56–57.5

Fit note on the Raider page: "It has a snug riding cut with a longer body, so most riders size up one, and two if they usually wear 2XL or larger." Its size panel is tagged "Runs small" [1]. The page doesn't say whether "size up" means above the chart size or above the size you usually wear. If you're unsure, First MFG takes sizing calls at (800) 537-3030.

Fillmore (men's leather jacket)

Size	Chest (body, in)	Waist (body, in)
XS	36–37.5	32–33.5
S	38.5–40	34.5–36
M	41–42.5	37–38.5
L	43.5–45	39.5–41
XL	46–47.5	42–43.5
XXL	48.5–50	44.5–46
3XL	51–52.5	47–48.5
4XL	53.5–55	49.5–51
5XL	56–57.5	52–53.5

Fit note on the Fillmore page: "True to size per the chart. Snug riding fit with a longer body." Its size panel is also tagged "Runs small" [2], so the page sends mixed signals. Go by the chart and the measuring rule above.

Commuter (men's leather jacket)

Size	Chest (body, in)	Waist (body, in)
S	38.5–40	33.5–35
M	41–42.5	36–37.5
L	43.5–45	38.5–40
XL	46–47.5	41–42.5
XXL	48.5–50	43.5–45
3XL	51–52.5	46–47.5
4XL	53.5–55	48.5–50
5XL	56–57.5	51–52.5

Fit note on the Commuter page: "Runs ½ to 1 size large. Slim builds should size down one." [3]

Hammer Down (men's club-style leather vest)

Size	Chest (body, in)	Waist (body, in)
S	38–39.5	35–36.5
M	40.5–42	37.5–39
L	43–44.5	40–41.5
XL	45.5–47	42.5–44
XXL	48–49.5	45–46.5
3XL	50.5–52	47.5–49
4XL	53–54.5	50–51.5
5XL	55.5–57	52.5–54

The vest chart's back length is listed as "Center back length (regular)" [4]. The page has no extra fit note beyond the measuring rule.

Women's jackets

Electra (women's leather jacket)

Size	Chest (body, in)	Waist (body, in)
XS	32–33	35.5–36.5
S	34–35	37.5–38.5
M	36–37	39.5–40.5
L	38.5–40	42–43.5
XL	41.5–43	45–46.5
2XL	44.5–46	48–49.5
3XL	47.5–49	51–52.5
4XL	50.5–52	54–55.5
5XL	53.5–55	57–58.5

Biker (women's leather jacket)

Size	Chest (body, in)	Waist (body, in)
XS	33–34	31–32
S	35–36	33–34
M	37–38	35–36
L	39.5–41	37.5–39
XL	42.5–44	40.5–42
XXL	45.5–47	43.5–45
3XL	48.5–50	46.5–48
4XL	51.5–53	49.5–51
5XL	54.5–56	52.5–54

Neither women's page adds a fit note beyond "Measure your chest (or stomach, if larger) and use the bigger number." [5][6] On the Electra chart the body-waist range for each size is larger than the body-chest range (M: chest 36–37, waist 39.5–40.5) [5]; on the Biker chart it's the other way round (M: chest 37–38, waist 35–36) [6]. Check both rows against your own numbers.

Worked examples (straight from the charts)

Each row uses the larger of chest or stomach, as First MFG says to.

Chest or stomach (larger)	Raider	Fillmore	Commuter	Hammer Down vest
42 in	L (41–42.5)	M (41–42.5)	M (41–42.5)	M (40.5–42)
44 in	XL (43.5–45)	L (43.5–45)	L (43.5–45)	L (43–44.5)
49 in	3XL (48.5–50)	XXL (48.5–50)	XXL (48.5–50)	XXL (48–49.5)

Chest or stomach (larger)	Electra (women's)	Biker (women's)
37 in	M (36–37)	M (37–38)
40 in	L (38.5–40)	L (39.5–41)

The charts have small gaps between sizes (for example, Fillmore M ends at 42.5 in and L starts at 43.5 in) [2]. If you land in a gap, that's "between sizes": the Electra, Biker and Hammer Down size panels say go one size up [4][5][6], and every page's FAQ suggests the Made To Measure option or a call to (800) 537-3030 [1]–[6].

How to choose

Measure chest and stomach over a T-shirt and take the bigger number.
Open the chart on the exact jacket or vest page. Don't carry a size over from another First MFG jacket, let alone another brand.
Read that page's fit note. Raider says size up, Commuter says it runs large, Fillmore says true to the chart [1][2][3].
Buying at a retailer? RevZilla and Cycle Gear sell many of these jackets. Their listing may show a different chart; when in doubt, compare against First MFG's own product page.

Yardstick's size tools don't have First MFG charts loaded yet, because each jacket has its own chart, so on our deal cards these show as deals we can't size yet (how we size).

Common questions

Does First Manufacturing use one size chart for all jackets?

No. Every First MFG product page we checked says: "Each product from First MFG comes with its own unique size chart." The charts really do differ. A 42 inch body chest is an L on the Raider chart but an M on the Fillmore and Commuter charts.

Which measurement do I use for a First Manufacturing jacket?

First MFG says to measure your chest in inches (or your stomach if it is larger) and use the larger measurement when you read the size chart. Measure the chest around the fullest part, under the arms, with the tape level, and the stomach around its widest point.

What if I'm between sizes on a First MFG chart?

The size panel on the Electra, Biker and Hammer Down pages says "Between sizes? Go one size up." The FAQ on all six pages we checked suggests the Made To Measure option if you're between sizes, and First MFG takes sizing questions at (800) 537-3030.

Does the First Manufacturing Raider run small?

First MFG's Raider page says it has a snug riding cut with a longer body, "so most riders size up one, and two if they usually wear 2XL or larger", and its size panel is tagged "Runs small". The Commuter page says the opposite: it "runs ½ to 1 size large" and slim builds should size down one.

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Sources

All numbers above are copied from First MFG's published charts (inches; each page also has a cm view). We don't add our own conversions. Charts change, and each product has its own, so always check the chart on the exact product page before you buy. Last checked November 9, 2026.