Monday Swimwear vs Vitamin A: Which Premium Swim Brand Fits You?

Two premium resort swim labels come up again and again when shoppers want a suit that lasts more than one season: Monday Swimwear and Vitamin A. Both are sustainable, both sit in the $80-and-up range, and both photograph beautifully. But they solve different problems. This comparison is built from each brand’s published size charts, fabric specs, and return policies, plus third-party reviews.

Quick verdict

If you have a fuller bust or a small band with a large cup, Monday Swimwear is the more flexible fit, thanks to its P–VVV sizing and underwire tops. If your priority is fabric hand, minimalist tailoring, and made-in-California craftsmanship, Vitamin A is the stronger pick. Vitamin A also carries the higher price ceiling. Monday is friendlier to full-bust bodies; Vitamin A is friendlier to the fabric snob.

At a glance

	Monday Swimwear	Vitamin A
Typical price	~$80–$190	~$85–$325
Size range	PP–VVV (roughly US 00–18, cups to G)	XXS–XL (roughly US 00–16)
Signature fabric	82% recycled nylon / 18% spandex jersey	EcoLux recycled matte jersey (~83% recycled nylon / 17% elastane)
Made in	Imported, ethically produced	Majority made in California, USA
Bust support	Underwire, wide straps, small-band-large-cup line	Shelf bras, removable cups, light-to-moderate
Best for	Full-bust and small-band-large-cup fits	Minimalist sculpted styles, fabric-first shoppers
Sustainability	Recycled nylon from industrial waste	Recycled nylon, California-made

Fit and sizing

Monday builds around bust fit first. Its sizing runs PP through VVV, where V, VV, and VVV stand for Voluptuous, Very Voluptuous, and Very, Very Voluptuous. Many tops use underwire and a tie-back closure, so the band adjusts to you. In a hands-on test, the writer behind Stella in Paradise, who wears a 36G, found Monday’s underwire Cala Roja top fit her cups well and praised the supportive wide straps, calling the brand her repeat choice for a large bust (Stella in Paradise).

Vitamin A takes the minimalist route. Support comes from internal shelf bras and removable cups rather than underwire, which flatters smaller-to-average busts and gives a cleaner line under fabric. If you want a suit that disappears against the body, that works in Vitamin A’s favor. If you need lift and containment, it’s less forgiving.

Winner: Monday Swimwear. For full-bust and small-band-large-cup bodies, adjustable underwire beats a shelf bra.

Size inclusivity

Monday’s range is genuinely broad. Per its fit guide, sizes span PP (US 00) to VVV (US 16–18), and its top range caters to cups up to F and G through the dedicated small-band-large-cup collection. That collection lists recommended bra sizes like 28G, 30FF, and 32F, which most swim brands never touch.

Vitamin A’s published size chart runs XXS to XL, roughly US 00 to 16. That covers a solid middle range, but it stops short of Monday’s cup-specific ceiling and doesn’t offer band-versus-cup separation.

Winner: Monday Swimwear. A wider grade and cup-level fitting reach more bodies.

Fabric and quality

This is where Vitamin A earns its reputation. Its EcoLux fabric is a superfine matte recycled-nylon jersey the brand pioneered as one of the original eco-swim materials, described as a soft, buttery flat jersey (Good On You). Retail listings confirm the EcoLux blend of recycled nylon and Lycra across core styles (Refinery29). The matte finish and dense knit read as expensive in person.

Monday’s fabric is also recycled nylon, typically an 82% recycled nylon / 18% spandex jersey, with some styles running a 94/6 shell. It’s a quality knit, but one honest reviewer noted she struggled to feel fully confident in the price point on fabric alone, comparing it to heavier knits from other labels at similar prices (Eva Darling). Monday’s shimmer and crinkle textures win praise; the plain nylons are good, not extraordinary.

Winner: Vitamin A. The EcoLux matte jersey has a hand and finish that’s hard to match at any price.

Styles and coverage

Vitamin A leans sculpted and minimalist: high-leg bottoms, clean square necklines, triangle tops with removable cups. The aesthetic is understated California, and it suits neutral palettes and elongated silhouettes. Coverage skews cheeky on bottoms and minimal-to-moderate on tops.

Monday spans more ground. You’ll find triangle and minimal tops alongside supportive underwire balconettes, plus one-pieces with open backs and full-coverage options, and a resort layer of cover-ups and sarongs. If you like to mix a supportive top with a cheeky or full bottom, Monday makes that easy.

Winner: Tie. Vitamin A owns the minimalist sculpted look; Monday owns range and coverage flexibility. Pick by taste.

Price and value

Monday’s suits generally run about $80 to $190. Tops often land near $80 to $115, one-pieces near $150 to $197. Vitamin A starts around the same floor but climbs higher, with one-pieces reaching roughly $195 to $325.

Value depends on what you weigh. If fabric hand and made-in-USA production justify the spend for you, Vitamin A’s ceiling is defensible. If you want strong fit and support without crossing $200, Monday delivers more fit engineering per dollar, especially for full busts.

Winner: Monday Swimwear, on price accessibility. Vitamin A wins on top-end fabric value if budget is no object.

Sustainability

Both brands take recycled materials seriously. Vitamin A is a California-based brand that manufactures the majority of its line in the USA and uses EcoLux made from recycled nylon (Good On You). Its California production shows up in independent made-in-USA directories (WhereDoTheyMakeIt).

Monday’s jersey is made from recycled nylon yarns spun from leftover industrial waste, which cuts virgin-material demand. Its suits are ethically produced but imported rather than domestically made.

Winner: Vitamin A, narrowly. Both use recycled nylon; Vitamin A adds local California manufacturing.

Shipping and returns

Monday accepts US returns within 14 days of delivery for a refund, store credit, or a one-time exchange, provided items are unworn with tags and liners attached. It charges a 4% returns processing fee, capped at $18, and doesn’t refund shipping (Monday refund policy). Free US and Australia shipping kicks in over $200; under that, standard shipping runs about $8 to $10 (Eva Darling). International returns are refund-only, with no exchange or store credit.

Vitamin A offers free US shipping over $150 and runs a standard return window for unworn items. Its lower free-shipping threshold is a small everyday advantage.

Winner: Vitamin A, slightly, for the lower free-shipping bar and no per-return processing fee. Read each policy before you buy, since sale items carry stricter terms at both brands.

Who should choose each

Choose Monday Swimwear if you have a fuller bust, wear a small band with a large cup, or want underwire support and a wide size grade. It’s also the better value if you’d rather not spend past $200 and you like mixing coverage levels across a set.

Choose Vitamin A if fabric feel is your top priority, you gravitate toward minimalist sculpted silhouettes and neutral tones, and made-in-California production matters to you. Its higher ceiling buys a matte jersey that genuinely feels different on.

The verdict

Neither brand is better in the abstract; they’re built for different bodies and priorities. Monday wins on fit range and support, and it’s the safer bet for full-bust shoppers and anyone who has struggled to find swim that fits both band and cup. Vitamin A wins on fabric hand, minimalist tailoring, and local craftsmanship, at a higher price. Match the brand to your own fit needs and budget, and you’ll be happy with either.

Ready to find your fit? Explore Monday’s size guide and shop the range.